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Loans - Credit Card Delinquency Status (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total | $ 320,243 | $ 320,472
Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 156,093 | 154,091
Revolving Loans Converted to Term | 558 | 456
Total | 156,651 | 154,547
Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 148,892 | 147,254
Revolving Loans Converted to Term | 508 | 412
Total | 149,400 | 147,666
International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 7,201 | 6,837
Revolving Loans Converted to Term | 50 | 44
Total | 7,251 | 6,881
Current | Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 142,201 | 140,521
Revolving Loans Converted to Term | 432 | 339
Total | 142,633 | 140,860
Current | International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 6,877 | 6,521
Revolving Loans Converted to Term | 37 | 31
Total | 6,914 | 6,552
30-59 days | Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 1,952 | 1,940
Revolving Loans Converted to Term | 30 | 28
Total | 1,982 | 1,968
30-59 days | International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 111 | 112
Revolving Loans Converted to Term | 5 | 4
Total | 116 | 116
60-89 days | Domestic credit card: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 1,450 | 1,454
Revolving Loans Converted to Term | 19 | 17
Total | 1,469 | 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 | 3,289 | 3,339
Revolving Loans Converted to Term | 27 | 28
Total | 3,316 | 3,367
Greater than 90 days | International card businesses: | Credit Card: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving Loans | 142 | 132
Revolving Loans Converted to Term | 4 | 5
Total | $ 146 | $ 137

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