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Loans - Credit Card Delinquency Status (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total | $ 277,340 | $ 251,624
Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 114,361 | 106,323
Revolving loans converted to term | 411 | 633
Total | 114,772 | 106,956
Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 108,364 | 97,969
Revolving loans converted to term | 359 | 535
Total | 108,723 | 98,504
International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 5,997 | 8,354
Revolving loans converted to term | 52 | 98
Total | 6,049 | 8,452
Current | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 105,985 | 95,629
Revolving loans converted to term | 327 | 487
Total | 106,312 | 96,116
Current | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 5,795 | 8,152
Revolving loans converted to term | 41 | 66
Total | 5,836 | 8,218
30-59 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 760 | 734
Revolving loans converted to term | 13 | 21
Total | 773 | 755
30-59 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 73 | 79
Revolving loans converted to term | 4 | 11
Total | 77 | 90
60-89 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 519 | 451
Revolving loans converted to term | 9 | 13
Total | 528 | 464
60-89 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 47 | 47
Revolving loans converted to term | 3 | 11
Total | 50 | 58
Greater than 90 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 1,100 | 1,155
Revolving loans converted to term | 10 | 14
Total | 1,110 | 1,169
Greater than 90 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 82 | 76
Revolving loans converted to term | 4 | 10
Total | $ 86 | $ 86

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