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Loans - Credit Card Delinquency Status (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total | $ 315,154 | $ 320,472
Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 150,103 | 154,091
Revolving Loans Converted to Term | 491 | 456
Total | 150,594 | 154,547
Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 143,417 | 147,254
Revolving Loans Converted to Term | 444 | 412
Total | 143,861 | 147,666
International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 6,686 | 6,837
Revolving Loans Converted to Term | 47 | 44
Total | 6,733 | 6,881
Current | Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 137,043 | 140,521
Revolving Loans Converted to Term | 373 | 339
Total | 137,416 | 140,860
Current | International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 6,368 | 6,521
Revolving Loans Converted to Term | 33 | 31
Total | 6,401 | 6,552
30-59 days | Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 1,709 | 1,940
Revolving Loans Converted to Term | 26 | 28
Total | 1,735 | 1,968
30-59 days | International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 108 | 112
Revolving Loans Converted to Term | 5 | 4
Total | 113 | 116
60-89 days | Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 1,352 | 1,454
Revolving Loans Converted to Term | 19 | 17
Total | 1,371 | 1,471
60-89 days | International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 71 | 72
Revolving Loans Converted to Term | 4 | 4
Total | 75 | 76
Greater than 90 days | Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 3,313 | 3,339
Revolving Loans Converted to Term | 26 | 28
Total | 3,339 | 3,367
Greater than 90 days | International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 139 | 132
Revolving Loans Converted to Term | 5 | 5
Total | $ 144 | $ 137

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