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Loans - Credit Card Delinquency Status (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total | $ 303,943 | $ 277,340
Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 126,573 | 114,361
Revolving loans converted to term | 340 | 411
Total | 126,913 | 114,772
Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 120,978 | 108,364
Revolving loans converted to term | 301 | 359
Total | 121,279 | 108,723
International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 5,595 | 5,997
Revolving loans converted to term | 39 | 52
Total | 5,634 | 6,049
Current | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 117,410 | 105,985
Revolving loans converted to term | 266 | 327
Total | 117,676 | 106,312
Current | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 5,379 | 5,795
Revolving loans converted to term | 30 | 41
Total | 5,409 | 5,836
30-59 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 1,165 | 760
Revolving loans converted to term | 14 | 13
Total | 1,179 | 773
30-59 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 76 | 73
Revolving loans converted to term | 3 | 4
Total | 79 | 77
60-89 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 808 | 519
Revolving loans converted to term | 9 | 9
Total | 817 | 528
60-89 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 50 | 47
Revolving loans converted to term | 3 | 3
Total | 53 | 50
Greater than 90 days | Domestic credit card: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 1,595 | 1,100
Revolving loans converted to term | 12 | 10
Total | 1,607 | 1,110
Greater than 90 days | International card businesses: | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Revolving loans | 90 | 82
Revolving loans converted to term | 3 | 4
Total | $ 93 | $ 86

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