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Loans - Credit Card Delinquency Status (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total | $ 261,390 | $ 251,624
Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 104,572 | 106,323
Revolving loans converted to term | 458 | 633
Total | 105,030 | 106,956
Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 98,858 | 97,969
Revolving loans converted to term | 400 | 535
Total | 99,258 | 98,504
International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 5,714 | 8,354
Revolving loans converted to term | 58 | 98
Total | 5,772 | 8,452
Current | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 96,977 | 95,629
Revolving loans converted to term | 369 | 487
Total | 97,346 | 96,116
Current | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 5,534 | 8,152
Revolving loans converted to term | 45 | 66
Total | 5,579 | 8,218
30-59 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 632 | 734
Revolving loans converted to term | 14 | 21
Total | 646 | 755
30-59 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 67 | 79
Revolving loans converted to term | 5 | 11
Total | 72 | 90
60-89 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 417 | 451
Revolving loans converted to term | 8 | 13
Total | 425 | 464
60-89 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 41 | 47
Revolving loans converted to term | 4 | 11
Total | 45 | 58
Greater than 90 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 832 | 1,155
Revolving loans converted to term | 9 | 14
Total | 841 | 1,169
Greater than 90 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 72 | 76
Revolving loans converted to term | 4 | 10
Total | $ 76 | $ 86

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