Quarterly report pursuant to Section 13 or 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
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]      
Total $ 1,049,156   $ 1,053,732
Total gross charge-offs 1,738 $ 1,056  
Small Business Card Loans | United States      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross charge-offs 111   317
Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross charge-offs 11 $ 14  
Consumer real estate | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 227,435   228,403
Originated in current fiscal year 3,521   16,726
Originated in fiscal year before current fiscal year 15,991   39,828
Originated two years before current fiscal year 39,356   80,030
Originated three years before current fiscal year 78,984   37,990
Originated four years before current fiscal year 37,337   18,318
Prior 52,246   35,511
Total gross charge-offs 8   67
Gross charge-offs, Originated in current fiscal year 0   0
Gross charge-offs, Originated in fiscal year before current fiscal year 1   7
Gross charge-offs, Originated two years before current fiscal year 1   12
Gross charge-offs, Originated three years before current fiscal year 1   6
Gross charge-offs, Originated four years before current fiscal year 0   2
Gross charge-offs, Prior 5   40
Consumer real estate | Less than 620 | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 2,437   2,335
Originated in current fiscal year 32   115
Originated in fiscal year before current fiscal year 132   471
Originated two years before current fiscal year 480   589
Originated three years before current fiscal year 611   402
Originated four years before current fiscal year 422   136
Prior 760   622
Consumer real estate | Greater than or equal to 620 and less than 680 | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 4,619   4,671
Originated in current fiscal year 46   359
Originated in fiscal year before current fiscal year 375   919
Originated two years before current fiscal year 911   1,235
Originated three years before current fiscal year 1,227   777
Originated four years before current fiscal year 725   296
Prior 1,335   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 22,432   23,357
Originated in current fiscal year 314   1,934
Originated in fiscal year before current fiscal year 1,857   4,652
Originated two years before current fiscal year 4,272   6,988
Originated three years before current fiscal year 6,605   3,742
Originated four years before current fiscal year 3,645   1,836
Prior 5,739   4,205
Consumer real estate | Greater than or equal to 740 | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 187,303   187,077
Originated in current fiscal year 3,067   13,778
Originated in fiscal year before current fiscal year 13,216   33,436
Originated two years before current fiscal year 33,362   67,803
Originated three years before current fiscal year 67,187   30,235
Originated four years before current fiscal year 29,774   15,203
Prior 40,697   26,622
Less than or equal to 90 percent | Consumer real estate | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 213,881   214,661
Originated in current fiscal year 3,226   15,224
Originated in fiscal year before current fiscal year 14,662   38,225
Originated two years before current fiscal year 37,802   76,229
Originated three years before current fiscal year 75,271   35,072
Originated four years before current fiscal year 34,487   17,432
Prior 48,433   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 2,089   1,994
Originated in current fiscal year 145   698
Originated in fiscal year before current fiscal year 657   911
Originated two years before current fiscal year 913   286
Originated three years before current fiscal year 271   53
Originated four years before current fiscal year 51   25
Prior 52   21
Greater than 100 percent | Consumer real estate | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 821   785
Originated in current fiscal year 88   264
Originated in fiscal year before current fiscal year 261   342
Originated two years before current fiscal year 310   100
Originated three years before current fiscal year 88   31
Originated four years before current fiscal year 28   14
Prior 46   34
Fully-insured loans | Consumer real estate | Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 10,644   10,963
Originated in current fiscal year 62   540
Originated in fiscal year before current fiscal year 411   350
Originated two years before current fiscal year 331   3,415
Originated three years before current fiscal year 3,354   2,834
Originated four years before current fiscal year 2,771   847
Prior $ 3,715   $ 2,977