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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 160 | $ 412 | $ 422 | $ 704
Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 60 | 84 | 143 | 224
Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 66 | 138 | 181 | 264
Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 65 | 137 | 180 | 260
Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 1 | 1 | 1 | 4
Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 34 | 190 | 98 | 216
Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 0 | 9 | 20 | 28
Commercial Banking | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 34 | $ 181 | $ 78 | $ 188
Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 53.00% | 22.00% | 49.00% | 36.00%
Average Rate Reduction | 9.38% | 17.96% | 8.64% | 17.90%
Reduced Interest Rate | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 21.22% | 19.14% | 21.43% | 19.94%
Reduced Interest Rate | Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 38.00% | 5.00% | 36.00% | 12.00%
Average Rate Reduction | 8.62% | 4.19% | 8.85% | 3.55%
Reduced Interest Rate | Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 39.00% | 5.00% | 36.00% | 12.00%
Average Rate Reduction | 8.62% | 4.12% | 8.87% | 3.51%
Reduced Interest Rate | Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 10.00% | 31.00% | 4.00%
Average Rate Reduction | 0.00% | 8.37% | 3.77% | 11.42%
Reduced Interest Rate | Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00% | 0.00%
Average Rate Reduction | 0.00% | 0.00% | 0.00% | 0.00%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00% | 0.00%
Average Rate Reduction | 0.00% | 0.00% | 0.00% | 0.00%
Reduced Interest Rate | Commercial Banking | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00% | 0.00%
Average Rate Reduction | 0.00% | 0.00% | 0.00% | 0.00%
Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 49.00% | 57.00% | 52.00% | 52.00%
Average Term Extension (Months) | 3 months | 5 months | 3 months | 5 months
Term Extension | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00% | 0.00%
Average Term Extension (Months) | 0 months | 0 months | 0 months | 0 months
Term Extension | Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 91.00% | 95.00% | 94.00% | 93.00%
Average Term Extension (Months) | 4 months | 3 months | 3 months | 4 months
Term Extension | Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 91.00% | 95.00% | 94.00% | 95.00%
Average Term Extension (Months) | 4 months | 3 months | 3 months | 4 months
Term Extension | Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 59.00% | 69.00% | 15.00%
Average Term Extension (Months) | 41 months | 4 months | 28 months | 4 months
Term Extension | Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 56.00% | 55.00% | 51.00% | 57.00%
Average Term Extension (Months) | 17 months | 8 months | 11 months | 9 months
Term Extension | Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 100.00% | 100.00% | 100.00%
Average Term Extension (Months) | 0 months | 7 months | 14 months | 10 months
Term Extension | Commercial Banking | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 56.00% | 52.00% | 38.00% | 50.00%
Average Term Extension (Months) | 17 months | 8 months | 8 months | 8 months
Principal Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 4.00% |  | 2.00%
Gross Balance Reduction |  | $ 7 |  | $ 7
Principal Forgiveness | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% |  | 0.00%
Gross Balance Reduction |  | $ 0 |  | $ 0
Principal Forgiveness | Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% |  | 0.00%
Gross Balance Reduction |  | $ 0 |  | $ 0
Principal Forgiveness | Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% |  | 0.00%
Gross Balance Reduction |  | $ 0 |  | $ 0
Principal Forgiveness | Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% |  | 0.00%
Gross Balance Reduction |  | $ 0 |  | $ 0
Principal Forgiveness | Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 8.00% |  | 7.00%
Gross Balance Reduction |  | $ 7 |  | $ 7
Principal Forgiveness | Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% |  | 0.00%
Gross Balance Reduction |  | $ 0 |  | $ 0
Principal Forgiveness | Commercial Banking | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 9.00% |  | 8.00%
Gross Balance Reduction |  | $ 7 |  | $ 7
Domestic credit card: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 33 | $ 56 | $ 77 | $ 145
Domestic credit card: | Reduced Interest Rate | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 16.07% | 15.41% | 16.10% | 16.05%
Domestic credit card: | Term Extension | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00% | 0.00%
Average Term Extension (Months) | 0 months | 0 months | 0 months | 0 months
Domestic credit card: | Principal Forgiveness | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% |  | 0.00%
Gross Balance Reduction |  | $ 0 |  | $ 0
International card businesses: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 27 | $ 28 | $ 66 | $ 79
International card businesses: | Reduced Interest Rate | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 27.45% | 26.56% | 27.62% | 27.05%
International card businesses: | Term Extension | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00% | 0.00%
Average Term Extension (Months) | 0 months | 0 months | 0 months | 0 months
International card businesses: | Principal Forgiveness | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% |  | 0.00%
Gross Balance Reduction |  | $ 0 |  | $ 0

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