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Loans - Trouble Debt Restructurings (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 412 | $ 186 | $ 704 | $ 459
Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 84 | 114 | 224 | 259
Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 138 | 57 | 264 | 130
Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 137 | 52 | 260 | 124
Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 1 | 5 | 4 | 6
Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 190 | 15 | 216 | 70
Commercial Banking | Total commercial lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified |  | 14 |  | 69
Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | 9 |  | 28 | 34
Commercial Banking | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 181 | 14 | $ 188 | 35
Commercial Banking | Small-ticket commercial real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified |  | $ 1 |  | $ 1
Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 22.00% | 75.00% | 36.00% | 75.00%
Average Rate Reduction | 17.96% | 17.45% | 17.90% | 15.78%
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 | 19.14% | 20.32% | 19.94% | 20.17%
Reduced Interest Rate | Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 5.00% | 42.00% | 12.00% | 39.00%
Average Rate Reduction | 4.19% | 3.93% | 3.55% | 3.90%
Reduced Interest Rate | Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 5.00% | 46.00% | 12.00% | 41.00%
Average Rate Reduction | 4.12% | 3.78% | 3.51% | 3.81%
Reduced Interest Rate | Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 10.00% | 9.00% | 4.00% | 10.00%
Average Rate Reduction | 8.37% | 10.55% | 11.42% | 10.91%
Reduced Interest Rate | Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00% | 49.00%
Average Rate Reduction | 0.00% | 0.00% | 0.00% | 0.00%
Reduced Interest Rate | Commercial Banking | Total commercial lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 0.00% |  | 49.00%
Average Rate Reduction |  | 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% | 100.00%
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 | 0.00% | 0.00% | 0.00% | 0.00%
Average Rate Reduction | 0.00% | 0.00% | 0.00% | 0.00%
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 | 57.00% | 34.00% | 52.00% | 28.00%
Average Term Extension (Months) | 5 months | 7 months | 5 months | 6 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 | 95.00% | 86.00% | 93.00% | 89.00%
Average Term Extension (Months) | 3 months | 8 months | 4 months | 7 months
Term Extension | Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 95.00% | 89.00% | 95.00% | 90.00%
Average Term Extension (Months) | 3 months | 8 months | 4 months | 7 months
Term Extension | Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 59.00% | 57.00% | 15.00% | 61.00%
Average Term Extension (Months) | 4 months | 3 months | 4 months | 3 months
Term Extension | Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 55.00% | 98.00% | 57.00% | 20.00%
Average Term Extension (Months) | 8 months | 3 months | 9 months | 0 months
Term Extension | Commercial Banking | Total commercial lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  | 100.00% |  | 20.00%
Average Term Extension (Months) |  | 3 months |  | 1 month
Term Extension | Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% |  | 100.00% | 0.00%
Average Term Extension (Months) | 7 months |  | 10 months | 0 months
Term Extension | Commercial Banking | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 52.00% | 100.00% | 50.00% | 40.00%
Average Term Extension (Months) | 8 months | 3 months | 8 months | 1 month
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 | 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 | $ 56 | $ 74 | $ 145 | $ 172
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 | 15.41% | 16.60% | 16.05% | 16.50%
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 | $ 28 | $ 40 | $ 79 | $ 87
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 | 26.56% | 27.25% | 27.05% | 27.44%
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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