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Loans - TDR Disclosures in Progress Financial Impact of Modification (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 998 | $ 1,053 | $ 1,520
Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 524 | 596 | 575
Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 275 | 241 | 356
Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 268 | 227 | 324
Consumer Banking | Home loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified |  | 6 | 19
Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 7 | 8 | 13
Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 199 | 216 | 589
Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 198 | 213 | 586
Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 39 | 43 | 29
Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | 159 | 170 | 557
Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 1 | $ 3 | $ 3
Reduced Interest Rate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 67.00% | 68.00% | 55.00%
Average Rate Reduction | 16.37% | 16.84% | 13.19%
Reduced Interest Rate | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 20.12% | 19.34% | 18.02%
Reduced Interest Rate | Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 38.00% | 48.00% | 44.00%
Average Rate Reduction | 3.68% | 3.93% | 3.79%
Reduced Interest Rate | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 39.00% | 49.00% | 44.00%
Average Rate Reduction | 3.63% | 3.88% | 3.82%
Reduced Interest Rate | Consumer Banking | Home loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 28.00% | 48.00%
Average Rate Reduction |  | 1.78% | 2.77%
Reduced Interest Rate | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 11.00% | 16.00% | 22.00%
Average Rate Reduction | 10.66% | 10.92% | 5.77%
Reduced Interest Rate | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 19.00% | 0.00% | 18.00%
Average Rate Reduction | 0.04% | 1.03% | 0.79%
Reduced Interest Rate | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 19.00% | 0.00% | 18.00%
Average Rate Reduction | 0.04% | 1.03% | 0.79%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 87.00% | 0.00% | 7.00%
Average Rate Reduction | 0.00% | 0.00% | 0.02%
Reduced Interest Rate | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 3.00% | 0.00% | 19.00%
Average Rate Reduction | 0.33% | 1.03% | 0.80%
Reduced Interest Rate | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Average Rate Reduction | 0.00% | 0.00% | 0.00%
Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 28.00% | 32.00% | 44.00%
Average Term Extension (Months) | 7 months | 12 months | 16 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 | 89.00% | 87.00% | 93.00%
Average Term Extension (Months) | 7 months | 13 months | 16 months
Term Extension | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 90.00% | 89.00% | 95.00%
Average Term Extension (Months) | 7 months | 8 months | 6 months
Term Extension | Consumer Banking | Home loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 83.00% | 78.00%
Average Term Extension (Months) |  | 214 months | 233 months
Term Extension | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 54.00% | 43.00% | 73.00%
Average Term Extension (Months) | 3 months | 12 months | 10 months
Term Extension | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 18.00% | 59.00% | 57.00%
Average Term Extension (Months) | 7 months | 11 months | 16 months
Term Extension | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 18.00% | 60.00% | 57.00%
Average Term Extension (Months) | 7 months | 11 months | 16 months
Term Extension | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 13.00% | 80.00% | 26.00%
Average Term Extension (Months) | 1 month | 5 months | 5 months
Term Extension | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 20.00% | 54.00% | 59.00%
Average Term Extension (Months) | 8 months | 13 months | 17 months
Term Extension | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 4.00%
Average Term Extension (Months) | 0 months | 0 months | 0 months
Balance Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 1 | $ 1 | $ 7
Balance Reduction | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Balance Reduction | Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 2.00% | 1.00% | 2.00%
Gross Balance Reduction | $ 1 | $ 1 | $ 7
Balance Reduction | Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 1.00% | 1.00% | 2.00%
Gross Balance Reduction | $ 1 | $ 1 | $ 7
Balance Reduction | Consumer Banking | Home loan |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 0.00% | 2.00%
Gross Balance Reduction |  | $ 0 | $ 0
Balance Reduction | Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 33.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Balance Reduction | Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Balance Reduction | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Balance Reduction | 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
Balance Reduction | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Balance Reduction | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 0.00% | 0.00% | 0.00%
Gross Balance Reduction | $ 0 | $ 0 | $ 0
Domestic credit card | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 351 | $ 412 | $ 406
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 | 16.60% | 15.93% | 14.50%
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 | Balance Reduction | 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 business | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Total Loans Modified | $ 173 | $ 184 | $ 169
International card business | Reduced Interest Rate | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 27.28% | 26.96% | 26.51%
International card business | 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 business | Balance Reduction | 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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