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Loans - TDR - Subsequent Defaults (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) contract | Sep. 30, 2020 USD ($) contract | Sep. 30, 2021 USD ($) contract | Sep. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 19,001 | 18,541 | 64,707 | 76,520
Total Loans | $ | $ 96 | $ 63 | $ 361 | $ 233
Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 16,848 | 17,227 | 58,237 | 73,060
Total Loans | $ | $ 24 | $ 31 | $ 93 | $ 125
Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 2,152 | 1,310 | 6,462 | 3,449
Total Loans | $ | $ 34 | $ 16 | $ 98 | $ 43
Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 2,151 | 1,307 | 6,453 | 3,442
Total Loans | $ | $ 34 | $ 15 | $ 98 | $ 42
Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1 | 3 | 9 | 7
Total Loans | $ | $ 0 | $ 1 | $ 0 | $ 1
Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1 | 4 | 8 | 11
Total Loans | $ | $ 38 | $ 16 | $ 170 | $ 65
Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 0 | 0 | 1 | 0
Total Loans | $ | $ 0 | $ 0 | $ 50 | $ 0
Commercial Banking | Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1 | 4 | 7 | 11
Total Loans | $ | $ 38 | $ 16 | $ 120 | $ 65
Domestic credit card: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 4,168 | 6,554 | 13,528 | 27,022
Total Loans | $ | $ 7 | $ 14 | $ 25 | $ 57
International card businesses: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 12,680 | 10,673 | 44,709 | 46,038
Total Loans | $ | $ 17 | $ 17 | $ 68 | $ 68

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