Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Residential Mortgage - Credit Quality Indicators (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Residential Mortgage - Credit Quality Indicators (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]      
Total $ 1,053,732 $ 1,045,747  
Total gross charge-offs 4,817 3,439 $ 3,797
Small Business Card Loans | United States      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross charge-offs 317 172  
Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross charge-offs 103 206 $ 78
Consumer real estate | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 228,403 229,670  
Originated in current fiscal year 16,726 41,529  
Originated in fiscal year before current fiscal year 39,828 85,803  
Originated two years before current fiscal year 80,030 40,466  
Originated three years before current fiscal year 37,990 19,959  
Originated four years before current fiscal year 18,318 5,906  
Prior 35,511 36,007  
Total gross charge-offs 67 161  
Gross charge-offs, Originated in current fiscal year 0 0  
Gross charge-offs, Originated in fiscal year before current fiscal year 7 6  
Gross charge-offs, Originated two years before current fiscal year 12 5  
Gross charge-offs, Originated three years before current fiscal year 6 6  
Gross charge-offs, Originated four years before current fiscal year 2 1  
Gross charge-offs, Prior 40 143  
Consumer real estate | Less than 620 | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 2,335 2,156  
Originated in current fiscal year 115 377  
Originated in fiscal year before current fiscal year 471 518  
Originated two years before current fiscal year 589 373  
Originated three years before current fiscal year 402 124  
Originated four years before current fiscal year 136 84  
Prior 622 680  
Consumer real estate | Greater than or equal to 620 and less than 680 | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 4,671 4,978  
Originated in current fiscal year 359 1,011  
Originated in fiscal year before current fiscal year 919 1,382  
Originated two years before current fiscal year 1,235 840  
Originated three years before current fiscal year 777 329  
Originated four years before current fiscal year 296 233  
Prior 1,085 1,183  
Consumer real estate | Greater than or equal to 680 and less than 740 | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 23,357 25,444  
Originated in current fiscal year 1,934 5,411  
Originated in fiscal year before current fiscal year 4,652 8,290  
Originated two years before current fiscal year 6,988 4,369  
Originated three years before current fiscal year 3,742 2,187  
Originated four years before current fiscal year 1,836 830  
Prior 4,205 4,357  
Consumer real estate | Greater than or equal to 740 | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 187,077 185,398  
Originated in current fiscal year 13,778 34,150  
Originated in fiscal year before current fiscal year 33,436 71,946  
Originated two years before current fiscal year 67,803 31,782  
Originated three years before current fiscal year 30,235 16,370  
Originated four years before current fiscal year 15,203 4,603  
Prior 26,622 26,547  
Less than or equal to 90 percent | Consumer real estate | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 214,661 215,713  
Originated in current fiscal year 15,224 39,625  
Originated in fiscal year before current fiscal year 38,225 81,437  
Originated two years before current fiscal year 76,229 37,228  
Originated three years before current fiscal year 35,072 18,980  
Originated four years before current fiscal year 17,432 5,734  
Prior 32,479 32,709  
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,994 1,615  
Originated in current fiscal year 698 950  
Originated in fiscal year before current fiscal year 911 530  
Originated two years before current fiscal year 286 93  
Originated three years before current fiscal year 53 15  
Originated four years before current fiscal year 25 8  
Prior 21 19  
Greater than 100 percent | Consumer real estate | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 785 648  
Originated in current fiscal year 264 374  
Originated in fiscal year before current fiscal year 342 169  
Originated two years before current fiscal year 100 43  
Originated three years before current fiscal year 31 15  
Originated four years before current fiscal year 14 8  
Prior 34 39  
Fully-insured loans | Consumer real estate | Residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 10,963 11,694  
Originated in current fiscal year 540 580  
Originated in fiscal year before current fiscal year 350 3,667  
Originated two years before current fiscal year 3,415 3,102  
Originated three years before current fiscal year 2,834 949  
Originated four years before current fiscal year 847 156  
Prior $ 2,977 $ 3,240