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Loans - TDR - Subsequent Defaults (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 96,905 | 122,156 | 129,120
Total Loans | $ | $ 414 | $ 306 | $ 437
Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 91,002 | 116,556 | 122,084
Total Loans | $ | $ 156 | $ 209 | $ 232
Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 5,887 | 5,599 | 7,009
Total Loans | $ | $ 78 | $ 72 | $ 82
Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 5,877 | 5,575 | 6,980
Total Loans | $ | $ 77 | $ 70 | $ 79
Consumer Banking | Home Loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 0 | 0 | 3
Total Loans | $ | $ 0 | $ 0 | $ 1
Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 10 | 24 | 26
Total Loans | $ | $ 1 | $ 2 | $ 2
Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 16 | 1 | 27
Total Loans | $ | $ 180 | $ 25 | $ 123
Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 1 | 0 | 1
Total Loans | $ | $ 50 | $ 0 | $ 3
Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 15 | 1 | 26
Total Loans | $ | $ 130 | $ 25 | $ 120
Domestic credit card: | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 32,639 | 47,086 | 61,070
Total Loans | $ | $ 69 | $ 99 | $ 126
International card businesses: | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 58,363 | 69,470 | 61,014
Total Loans | $ | $ 87 | $ 110 | $ 106

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