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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 179 | $ 481 | $ 601 | $ 1,185
Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 65 | 89 | 208 | 313
Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 89 | 134 | 270 | 398
Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 89 | 133 | 269 | 393
Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified |  | 1 | 1 | 5
Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 25 | 258 | 123 | 474
Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 21 | 57 | 41 | 85
Commercial Banking | Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 4 | $ 201 | $ 82 | $ 389
Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 61.00% | 19.00% | 53.00% | 29.00%
Average Rate Reduction | 68.95% | 20.08% | 16.84% | 18.49%
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 | 20.90% | 20.94% | 21.26% | 20.22%
Reduced Interest Rate | Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 48.00% | 4.00% | 40.00% | 9.00%
Average Rate Reduction | 8.54% | 4.75% | 8.72% | 3.76%
Reduced Interest Rate | Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 48.00% | 3.00% | 40.00% | 9.00%
Average Rate Reduction | 8.54% | 4.83% | 8.74% | 3.68%
Reduced Interest Rate | Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 85.00% | 20.00% | 9.00%
Average Rate Reduction |  | 3.24% | 2.55% | 10.85%
Reduced Interest Rate | Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 12.00% | 0.00% | 2.00% | 0.00%
Average Rate Reduction | 2.50% | 0.00% | 1.29% | 0.00%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 14.00% | 0.00% | 7.00% | 0.00%
Average Rate Reduction | 2.50% | 0.00% | 1.29% | 0.00%
Reduced Interest Rate | Commercial Banking | Commercial And Industrial [Member] |  |  |  |
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 | 59.00% | 61.00% | 54.00% | 56.00%
Average Term Extension (Months) | 6 months | 14 months | 5 months | 9 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 | 92.00% | 94.00% | 93.00% | 94.00%
Average Term Extension (Months) | 4 months | 2 months | 4 months | 3 months
Term Extension | Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 92.00% | 94.00% | 93.00% | 95.00%
Average Term Extension (Months) | 4 months | 2 months | 4 months | 3 months
Term Extension | Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 15.00% | 36.00% | 15.00%
Average Term Extension (Months) |  | 61 months | 67 months | 8 months
Term Extension | Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 64.00% | 61.00% | 61.00%
Average Term Extension (Months) | 11 months | 23 months | 11 months | 16 months
Term Extension | Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00% | 100.00%
Average Term Extension (Months) | 12 months | 4 months | 13 months | 6 months
Term Extension | Commercial Banking | Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 54.00% | 41.00% | 52.00%
Average Term Extension (Months) | 4 months | 32 months | 8 months | 21 months
Principal Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% | 0.00% | 1.00%
Gross Balance Reduction |  | $ 1 | $ 1 | $ 8
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% | 0.00%
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% | 0.00%
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% | 0.00%
Gross Balance Reduction |  | $ 0 | $ 0 | $ 0
Principal Forgiveness | Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% | 0.00% | 3.00%
Gross Balance Reduction |  | $ 0 | $ 0 | $ 7
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% | 0.00% | 4.00%
Gross Balance Reduction |  | $ 0 | $ 0 | $ 7
Domestic credit card: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 37 | $ 50 | $ 114 | $ 195
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 | 15.80% | 15.53% | 16.00% | 15.92%
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% | 0.00%
Gross Balance Reduction |  | $ 0 | $ 0 | $ 0
International card businesses: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 28 | $ 39 | $ 94 | $ 118
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 | 27.75% | 27.89% | 27.66% | 27.33%
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% | 0.00%
Gross Balance Reduction |  | $ 0 | $ 0 | $ 0

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