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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 1,489 | $ 998 | $ 1,053
Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 411 | 524 | 596
Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 541 | 275 | 241
Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 536 | 268 | 227
Consumer Banking | Home Loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified |  |  | 6
Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 5 | 7 | 8
Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 537 | 199 | 216
Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified |  | 198 | 213
Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 98 | 39 | 43
Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 439 | 159 | 170
Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified |  | $ 1 | $ 3
Reduced Interest Rate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 33.00% | 67.00% | 68.00%
Average Rate Reduction | 18.06% | 16.37% | 16.84%
Reduced Interest Rate | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 20.61% | 20.12% | 19.34%
Reduced Interest Rate | Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 11.00% | 38.00% | 48.00%
Average Rate Reduction | 5.73% | 3.68% | 3.93%
Reduced Interest Rate | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 11.00% | 39.00% | 49.00%
Average Rate Reduction | 5.68% | 3.63% | 3.88%
Reduced Interest Rate | Consumer Banking | Home Loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 28.00%
Average Rate Reduction |  |  | 1.78%
Reduced Interest Rate | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 11.00% | 11.00% | 16.00%
Average Rate Reduction | 10.86% | 10.66% | 10.92%
Reduced Interest Rate | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 3.00% | 19.00% | 0.00%
Average Rate Reduction | 0.14% | 0.04% | 1.03%
Reduced Interest Rate | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 19.00% | 0.00%
Average Rate Reduction |  | 0.04% | 1.03%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 87.00% | 0.00%
Average Rate Reduction | 0.00% | 0.00% | 0.00%
Reduced Interest Rate | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 4.00% | 3.00% | 0.00%
Average Rate Reduction | 0.14% | 0.33% | 1.03%
Reduced Interest Rate | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 0.00% | 0.00%
Average Rate Reduction |  | 0.00% | 0.00%
Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 55.00% | 28.00% | 32.00%
Average Term Extension (Months) | 8 months | 7 months | 12 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 | 94.00% | 89.00% | 87.00%
Average Term Extension (Months) | 3 months | 7 months | 13 months
Term Extension | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 95.00% | 90.00% | 89.00%
Average Term Extension (Months) | 3 months | 7 months | 8 months
Term Extension | Consumer Banking | Home Loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 83.00%
Average Term Extension (Months) |  |  | 214 months
Term Extension | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 20.00% | 54.00% | 43.00%
Average Term Extension (Months) | 8 months | 3 months | 12 months
Term Extension | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 58.00% | 18.00% | 59.00%
Average Term Extension (Months) | 17 months | 7 months | 11 months
Term Extension | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 18.00% | 60.00%
Average Term Extension (Months) |  | 7 months | 11 months
Term Extension | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 86.00% | 13.00% | 80.00%
Average Term Extension (Months) | 5 months | 1 month | 5 months
Term Extension | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 52.00% | 20.00% | 54.00%
Average Term Extension (Months) | 21 months | 8 months | 13 months
Term Extension | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 0.00% | 0.00%
Average Term Extension (Months) |  | 0 months | 0 months
Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 1.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 8 | $ 1 | $ 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% | 2.00% | 1.00%
Gross Balance Reduction | $ 1 | $ 1 | $ 1
Principal Forgiveness | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 1.00% | 1.00%
Gross Balance Reduction | $ 1 | $ 1 | $ 1
Principal Forgiveness | Consumer Banking | Home Loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 0.00%
Gross Balance Reduction |  |  | $ 0
Principal Forgiveness | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 33.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Principal Forgiveness | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 3.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 7 | $ 0 | $ 0
Principal Forgiveness | Commercial Banking | Total commercial lending |  |  |
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 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 |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 4.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 7 | $ 0 | $ 0
Principal Forgiveness | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 0.00% | 0.00%
Gross Balance Reduction |  | $ 0 | $ 0
Domestic credit card: | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 243 | $ 351 | $ 412
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 | 15.94% | 16.60% | 15.93%
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 | $ 168 | $ 173 | $ 184
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 | 27.38% | 27.28% | 26.96%
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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