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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 812 | $ 1,489 | $ 998
Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 277 | 411 | 524
Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 374 | 541 | 275
Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 371 | 536 | 268
Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 3 | 5 | 7
Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 161 | 537 | 199
Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified |  |  | 198
Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 49 | 98 | 39
Commercial Banking | Commercial And Industrial [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 112 | $ 439 | 159
Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified |  |  | $ 1
Reduced Interest Rate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 55.00% | 33.00% | 67.00%
Average Rate Reduction | 16.26% | 18.06% | 16.37%
Reduced Interest Rate | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 21.15% | 20.61% | 20.12%
Reduced Interest Rate | Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 42.00% | 11.00% | 38.00%
Average Rate Reduction | 8.70% | 5.73% | 3.68%
Reduced Interest Rate | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 43.00% | 11.00% | 39.00%
Average Rate Reduction | 8.72% | 5.68% | 3.63%
Reduced Interest Rate | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 13.00% | 11.00% | 11.00%
Average Rate Reduction | 2.94% | 10.86% | 10.66%
Reduced Interest Rate | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 6.00% | 3.00% | 19.00%
Average Rate Reduction | 1.19% | 0.14% | 0.04%
Reduced Interest Rate | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 19.00%
Average Rate Reduction |  |  | 0.04%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 21.00% | 0.00% | 87.00%
Average Rate Reduction | 1.19% | 0.00% | 0.00%
Reduced Interest Rate | Commercial Banking | Commercial And Industrial [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 4.00% | 3.00%
Average Rate Reduction | 0.00% | 0.14% | 0.33%
Reduced Interest Rate | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 0.00%
Average Rate Reduction |  |  | 0.00%
Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 52.00% | 55.00% | 28.00%
Average Term Extension (Months) | 5 months | 8 months | 7 months
Term Extension | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Average Term Extension (Months) | 0 months | 0 months | 0 months
Term Extension | Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 93.00% | 94.00% | 89.00%
Average Term Extension (Months) | 4 months | 3 months | 7 months
Term Extension | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 93.00% | 95.00% | 90.00%
Average Term Extension (Months) | 4 months | 3 months | 7 months
Term Extension | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 30.00% | 20.00% | 54.00%
Average Term Extension (Months) | 42 months | 8 months | 3 months
Term Extension | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 46.00% | 58.00% | 18.00%
Average Term Extension (Months) | 9 months | 17 months | 7 months
Term Extension | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 18.00%
Average Term Extension (Months) |  |  | 7 months
Term Extension | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 85.00% | 86.00% | 13.00%
Average Term Extension (Months) | 11 months | 5 months | 1 month
Term Extension | Commercial Banking | Commercial And Industrial [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 30.00% | 52.00% | 20.00%
Average Term Extension (Months) | 6 months | 21 months | 8 months
Term Extension | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 0.00%
Average Term Extension (Months) |  |  | 0 months
Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 1.00% | 0.00%
Gross Balance Reduction | $ 1 | $ 8 | $ 1
Principal Forgiveness | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Principal Forgiveness | Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 2.00%
Gross Balance Reduction | $ 1 | $ 1 | $ 1
Principal Forgiveness | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 1.00%
Gross Balance Reduction | $ 1 | $ 1 | $ 1
Principal Forgiveness | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 33.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Principal Forgiveness | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 3.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 7 | $ 0
Principal Forgiveness | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 0.00%
Gross Balance Reduction |  |  | $ 0
Principal Forgiveness | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Principal Forgiveness | Commercial Banking | Commercial And Industrial [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 4.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 7 | $ 0
Principal Forgiveness | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 0.00%
Gross Balance Reduction |  |  | $ 0
Domestic credit card: | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 154 | $ 243 | $ 351
Domestic credit card: | Reduced Interest Rate | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 15.90% | 15.94% | 16.60%
Domestic credit card: | Term Extension | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Average Term Extension (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% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
International card businesses: | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 123 | $ 168 | $ 173
International card businesses: | Reduced Interest Rate | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 27.70% | 27.38% | 27.28%
International card businesses: | Term Extension | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Average Term Extension (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% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0

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