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Loans - TDR - Subsequent Defaults (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) contract | Jun. 30, 2020 USD ($) contract | Jun. 30, 2021 USD ($) contract | Jun. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 21,334 | 27,954 | 45,706 | 57,979
Total Loans | $ | $ 198 | $ 78 | $ 265 | $ 170
Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 19,053 | 27,090 | 41,389 | 55,833
Total Loans | $ | $ 31 | $ 46 | $ 69 | $ 94
Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 2,274 | 863 | 4,310 | 2,139
Total Loans | $ | $ 35 | $ 11 | $ 64 | $ 27
Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 2,271 | 860 | 4,302 | 2,135
Total Loans | $ | $ 35 | $ 11 | $ 64 | $ 27
Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 3 | 3 | 8 | 4
Total Loans | $ | $ 0 | $ 0 | $ 0 | $ 0
Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 7 | 1 | 7 | 7
Total Loans | $ | $ 132 | $ 21 | $ 132 | $ 49
Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 1 | 0 | 1 | 0
Total Loans | $ | $ 50 | $ 0 | $ 50 | $ 0
Commercial Banking | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 6 | 1 | 6 | 7
Total Loans | $ | $ 82 | $ 21 | $ 82 | $ 49
Domestic credit card: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 4,226 | 9,582 | 9,360 | 20,468
Total Loans | $ | $ 8 | $ 21 | $ 18 | $ 43
International card businesses: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | contract | 14,827 | 17,508 | 32,029 | 35,365
Total Loans | $ | $ 23 | $ 25 | $ 51 | $ 51

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