Annual report pursuant to Section 13 and 15(d)

Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details)

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Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 58  
Due in one year or less, yield 1.85%  
Due after one year through five years, amount $ 5,803  
Due after one year through five years, yield 1.96%  
Due after five years through ten years, amount $ 117,347  
Due after five years though ten years, yield 1.38%  
Due after ten years, amount $ 471,383  
Due after ten years, yield 2.12%  
Amortized Cost $ 594,591 $ 632,863
Total, yield 1.97%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value $ 276,852 229,994
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less 57  
Due after One Year through Five Years 5,456  
Due after Five Years through Ten Years 99,608  
Due after Ten Years 391,476  
Held-to-maturity, fair value 496,597 524,267
AFS securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 100,618  
Due in one year or less, yield 5.03%  
Due after one year through five years, amount $ 102,633  
Due after one year through five years, yield 3.45%  
Due after five years through ten years, amount $ 27,804  
Due after five years through ten years, yield 3.68%  
Due after ten years, amount $ 49,629  
Due after ten years, yield 4.57%  
Amount $ 280,684  
Total, yield 4.24%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 100,623  
Due after one year through five years, amount 101,607  
Due after five years though ten years, amount 27,047  
Due after ten years, amount 47,575  
Fair Value 276,852  
Mortgage-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 1,763  
Due after one year through five years, yield 6.17%  
Due after five years through ten years, amount $ 7,483  
Due after five years through ten years, yield 4.59%  
Due after ten years, amount $ 44,342  
Due after ten years, yield 4.60%  
Amount $ 53,588  
Total, yield 4.65%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 1  
Due after one year through five years, amount 1,726  
Due after five years though ten years, amount 7,268  
Due after ten years, amount 42,469  
Fair Value 51,464  
Agency    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 4  
Due after one year through five years, yield 4.00%  
Due after five years through ten years, amount $ 8  
Due after five years through ten years, yield 3.38%  
Due after ten years, amount $ 39,183  
Due after ten years, yield 4.66%  
Amount $ 39,195  
Total, yield 4.66%  
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 0  
Due after one year through five years, yield 0.00%  
Due after five years through ten years, amount $ 12  
Due after five years though ten years, yield 2.67%  
Due after ten years, amount $ 465,444  
Due after ten years, yield 2.12%  
Amortized Cost $ 465,456 503,233
Total, yield 2.12%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due after one year through five years, amount 4  
Due after five years though ten years, amount 8  
Due after ten years, amount 37,800  
Fair Value 37,812  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 11  
Due after Ten Years 386,515  
Held-to-maturity, fair value 386,526 415,914
Agency-collateralized mortgage obligations    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 0  
Due after one year through five years, yield 0.00%  
Due after five years through ten years, amount $ 0  
Due after five years through ten years, yield 0.00%  
Due after ten years, amount $ 2,739  
Due after ten years, yield 3.39%  
Amount $ 2,739  
Total, yield 3.39%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due after one year through five years, amount 0  
Due after five years though ten years, amount 0  
Due after ten years, amount 2,544  
Fair Value 2,544  
Commercial    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 1,759  
Due after one year through five years, yield 6.18%  
Due after five years through ten years, amount $ 7,475  
Due after five years through ten years, yield 4.59%  
Due after ten years, amount $ 1,688  
Due after ten years, yield 2.61%  
Amount $ 10,922  
Total, yield 4.54%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 1  
Due after one year through five years, amount 1,720  
Due after five years though ten years, amount 7,260  
Due after ten years, amount 1,465  
Fair Value 10,446  
Non-agency residential    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 0  
Due after one year through five years, yield 0.00%  
Due after five years through ten years, amount $ 0  
Due after five years through ten years, yield 0.00%  
Due after ten years, amount $ 732  
Due after ten years, yield 10.48%  
Amount $ 732  
Total, yield 10.48%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due after one year through five years, amount 2  
Due after five years though ten years, amount 0  
Due after ten years, amount 660  
Fair Value 662  
U.S. Treasury and government agencies    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 79,257  
Due in one year or less, yield 5.29%  
Due after one year through five years, amount $ 86,631  
Due after one year through five years, yield 3.39%  
Due after five years through ten years, amount $ 14,868  
Due after five years through ten years, yield 2.72%  
Due after ten years, amount $ 42  
Due after ten years, yield 3.90%  
Amount $ 180,798  
Total, yield 4.17%  
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 4,563  
Due after one year through five years, yield 1.80%  
Due after five years through ten years, amount $ 117,082  
Due after five years though ten years, yield 1.38%  
Due after ten years, amount $ 0  
Due after ten years, yield 0.00%  
Amortized Cost $ 121,645 121,597
Total, yield 1.40%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 79,268  
Due after one year through five years, amount 85,674  
Due after five years though ten years, amount 14,374  
Due after ten years, amount 40  
Fair Value 179,356  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less 0  
Due after One Year through Five Years 4,279  
Due after Five Years through Ten Years 99,403  
Due after Ten Years 0  
Held-to-maturity, fair value 103,682 101,338
Non-U.S. securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 19,138  
Due in one year or less, yield 3.96%  
Due after one year through five years, amount $ 6,546  
Due after one year through five years, yield 1.82%  
Due after five years through ten years, amount $ 4,203  
Due after five years through ten years, yield 5.49%  
Due after ten years, amount $ 1,197  
Due after ten years, yield 5.07%  
Amount $ 31,084  
Total, yield 3.76%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 19,138  
Due after one year through five years, amount 6,554  
Due after five years though ten years, amount 4,204  
Due after ten years, amount 1,198  
Fair Value 31,094  
Other taxable securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 422  
Due in one year or less, yield 6.09%  
Due after one year through five years, amount $ 3,995  
Due after one year through five years, yield 6.14%  
Due after five years through ten years, amount $ 377  
Due after five years through ten years, yield 4.30%  
Due after ten years, amount $ 116  
Due after ten years, yield 3.27%  
Amount $ 4,910  
Total, yield 5.93%  
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 58  
Due in one year or less, yield 1.85%  
Due after one year through five years, amount $ 1,240  
Due after one year through five years, yield 2.57%  
Due after five years through ten years, amount $ 253  
Due after five years though ten years, yield 3.28%  
Due after ten years, amount $ 5,939  
Due after ten years, yield 2.49%  
Amortized Cost $ 7,490 8,033
Total, yield 2.52%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 419  
Due after one year through five years, amount 3,966  
Due after five years though ten years, amount 346  
Due after ten years, amount 107  
Fair Value 4,838  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less 57  
Due after One Year through Five Years 1,177  
Due after Five Years through Ten Years 194  
Due after Ten Years 4,961  
Held-to-maturity, fair value 6,389 $ 7,015
Tax-exempt securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 1,801  
Due in one year or less, yield 4.53%  
Due after one year through five years, amount $ 3,698  
Due after one year through five years, yield 3.62%  
Due after five years through ten years, amount $ 873  
Due after five years through ten years, yield 3.11%  
Due after ten years, amount $ 3,932  
Due after ten years, yield 4.17%  
Amount $ 10,304  
Total, yield 3.94%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 1,797  
Due after one year through five years, amount 3,687  
Due after five years though ten years, amount 855  
Due after ten years, amount 3,761  
Fair Value $ 10,100