Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Credit Card and Other Consumer - Credit Quality Indicators (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Credit Card and Other Consumer - 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  
Credit Card and Direct/ Indirect Consumer | Direct/indirect consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 102,849   103,468
Revolving Loans 48,169   48,908
Originated in current fiscal year 6,188   21,547
Originated in fiscal year before current fiscal year 19,473   15,794
Originated two years before current fiscal year 14,394   10,231
Originated three years before current fiscal year 8,803   3,428
Originated four years before current fiscal year 2,918   1,846
Prior 2,904   1,714
Revolving Loans 48,169   48,908
Total gross charge-offs 102   233
Gross charge-offs, Revolving Loans 1   5
Gross charge-offs, Originated in current fiscal year 1   32
Gross charge-offs, Originated in fiscal year before current fiscal year 35   95
Gross charge-offs, Originated two years before current fiscal year 33   53
Gross charge-offs, Originated three years before current fiscal year 18   15
Gross charge-offs, Originated four years before current fiscal year 4   10
Gross charge-offs, Prior 10   23
Gross charge-offs, Revolving Loans 1   5
Loans and lease receivable, securities based lending 48,000   48,800
Credit Card and Direct/ Indirect Consumer | Direct/indirect consumer | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,339   1,246
Revolving Loans 11   11
Originated in current fiscal year 35   292
Originated in fiscal year before current fiscal year 371   428
Originated two years before current fiscal year 452   336
Originated three years before current fiscal year 318   85
Originated four years before current fiscal year 76   55
Prior 76   39
Revolving Loans 11   11
Credit Card and Direct/ Indirect Consumer | Direct/indirect consumer | Greater than or equal to 620 and less than 680      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 2,441   2,506
Revolving Loans 11   11
Originated in current fiscal year 168   937
Originated in fiscal year before current fiscal year 894   799
Originated two years before current fiscal year 715   501
Originated three years before current fiscal year 436   121
Originated four years before current fiscal year 106   73
Prior 111   64
Revolving Loans 11   11
Credit Card and Direct/ Indirect Consumer | Direct/indirect consumer | Greater than or equal to 680 and less than 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 8,284   8,629
Revolving Loans 44   48
Originated in current fiscal year 790   3,451
Originated in fiscal year before current fiscal year 3,057   2,582
Originated two years before current fiscal year 2,281   1,641
Originated three years before current fiscal year 1,378   462
Originated four years before current fiscal year 386   244
Prior 348   201
Revolving Loans 44   48
Credit Card and Direct/ Indirect Consumer | Direct/indirect consumer | Greater than or equal to 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 42,130   41,656
Revolving Loans 68   74
Originated in current fiscal year 5,144   16,761
Originated in fiscal year before current fiscal year 15,089   11,802
Originated two years before current fiscal year 10,772   7,643
Originated three years before current fiscal year 6,601   2,707
Originated four years before current fiscal year 2,306   1,417
Prior 2,150   1,252
Revolving Loans 68   74
Credit Card and Direct/ Indirect Consumer | Direct/indirect consumer | Other internal credit metrics      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 48,655   49,431
Revolving Loans 48,035   48,764
Originated in current fiscal year 51   106
Originated in fiscal year before current fiscal year 62   183
Originated two years before current fiscal year 174   110
Originated three years before current fiscal year 70   53
Originated four years before current fiscal year 44   57
Prior 219   158
Revolving Loans 48,035   48,764
Credit Card and Direct/ Indirect Consumer | Credit card      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 97,491   101,323
Total Credit Card as of March 31, 2024 98,453   102,200
Revolving Loans 97,491   101,323
Revolving Loans Converted to Term Loans 962   877
Gross charge-offs, Revolving Loans 1,002   3,013
Gross charge-offs, Total Revolving Loans And Revolving Loans Converted to Term Loans 1,045   3,133
Gross charge-offs, Revolving Loans 1,002   3,013
Gross charge-offs, Revolving Loans Converted to Term Loans 43   120
Credit Card and Direct/ Indirect Consumer | Credit card | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 5,199   5,030
Total Credit Card as of March 31, 2024 5,549   5,338
Revolving Loans 5,199   5,030
Revolving Loans Converted to Term Loans 350   308
Credit Card and Direct/ Indirect Consumer | Credit card | Greater than or equal to 620 and less than 680      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 11,006   11,345
Total Credit Card as of March 31, 2024 11,304   11,623
Revolving Loans 11,006   11,345
Revolving Loans Converted to Term Loans 298   278
Credit Card and Direct/ Indirect Consumer | Credit card | Greater than or equal to 680 and less than 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 33,264   34,538
Total Credit Card as of March 31, 2024 33,522   34,777
Revolving Loans 33,264   34,538
Revolving Loans Converted to Term Loans 258   239
Credit Card and Direct/ Indirect Consumer | Credit card | Greater than or equal to 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 48,022   50,410
Total Credit Card as of March 31, 2024 48,078   50,462
Revolving Loans 48,022   50,410
Revolving Loans Converted to Term Loans 56   52
Credit Card and Direct/ Indirect Consumer | Credit card | Other internal credit metrics      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 0   0
Total Credit Card as of March 31, 2024 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans $ 0   $ 0