Annual report [Section 13 and 15(d), not S-K Item 405]

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, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]      
Total $ 1,095,835 $ 1,053,732  
Total gross charge-offs 7,054 4,817 $ 3,439
Small Business Card Loans | United States      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross charge-offs 489 317  
Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross charge-offs 42 103 $ 206
Consumer real estate | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 228,199 228,403  
Originated in current fiscal year 19,555 16,726  
Originated in fiscal year before current fiscal year 13,758 39,828  
Originated two years before current fiscal year 37,665 80,030  
Originated three years before current fiscal year 75,243 37,990  
Originated four years before current fiscal year 35,118 18,318  
Prior 46,860 35,511  
Total gross charge-offs 21 67  
Gross charge-offs, Originated in current fiscal year 2 0  
Gross charge-offs, Originated in fiscal year before current fiscal year 3 7  
Gross charge-offs, Originated two years before current fiscal year 6 12  
Gross charge-offs, Originated three years before current fiscal year 2 6  
Gross charge-offs, Originated four years before current fiscal year 1 2  
Gross charge-offs, Prior 7 40  
Consumer real estate | Less than 620 | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 2,619 2,335  
Originated in current fiscal year 172 115  
Originated in fiscal year before current fiscal year 171 471  
Originated two years before current fiscal year 484 589  
Originated three years before current fiscal year 649 402  
Originated four years before current fiscal year 427 136  
Prior 716 622  
Consumer real estate | Greater than or equal to 620 and less than 680 | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 4,687 4,671  
Originated in current fiscal year 329 359  
Originated in fiscal year before current fiscal year 337 919  
Originated two years before current fiscal year 826 1,235  
Originated three years before current fiscal year 1,201 777  
Originated four years before current fiscal year 736 296  
Prior 1,258 1,085  
Consumer real estate | Greater than or equal to 680 and less than 740 | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 22,666 23,357  
Originated in current fiscal year 2,008 1,934  
Originated in fiscal year before current fiscal year 1,553 4,652  
Originated two years before current fiscal year 4,112 6,988  
Originated three years before current fiscal year 6,322 3,742  
Originated four years before current fiscal year 3,431 1,836  
Prior 5,240 4,205  
Consumer real estate | Greater than or equal to 740 | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 188,314 187,077  
Originated in current fiscal year 16,758 13,778  
Originated in fiscal year before current fiscal year 11,507 33,436  
Originated two years before current fiscal year 31,941 67,803  
Originated three years before current fiscal year 63,918 30,235  
Originated four years before current fiscal year 27,956 15,203  
Prior 36,234 26,622  
Less than or equal to 90 percent | Consumer real estate | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 215,575 214,661  
Originated in current fiscal year 18,115 15,224  
Originated in fiscal year before current fiscal year 12,910 38,225  
Originated two years before current fiscal year 36,748 76,229  
Originated three years before current fiscal year 71,912 35,072  
Originated four years before current fiscal year 32,504 17,432  
Prior 43,386 32,479  
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 1,848 1,994  
Originated in current fiscal year 724 698  
Originated in fiscal year before current fiscal year 463 911  
Originated two years before current fiscal year 471 286  
Originated three years before current fiscal year 122 53  
Originated four years before current fiscal year 31 25  
Prior 37 21  
Greater than 100 percent | Consumer real estate | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 863 785  
Originated in current fiscal year 428 264  
Originated in fiscal year before current fiscal year 195 342  
Originated two years before current fiscal year 144 100  
Originated three years before current fiscal year 56 31  
Originated four years before current fiscal year 15 14  
Prior 25 34  
Fully-insured loans | Consumer real estate | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 9,913 10,963  
Originated in current fiscal year 288 540  
Originated in fiscal year before current fiscal year 190 350  
Originated two years before current fiscal year 302 3,415  
Originated three years before current fiscal year 3,153 2,834  
Originated four years before current fiscal year 2,568 847  
Prior $ 3,412 $ 2,977