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Loans - TDR Disclosures in Progress Financial Impact of Modification (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | $ 292 | $ 273
Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 140 | 145
Consumer Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 126 | 73
Consumer Banking | Auto |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 123 | 72
Consumer Banking | Retail banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 3 | 1
Commercial Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 26 | 55
Commercial Banking | Total commercial lending |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified |  | 55
Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 19 | 34
Commercial Banking | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | $ 7 | 21
Commercial Banking | Small-ticket commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified |  | $ 0
Reduced Interest Rate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 56.00% | 75.00%
Average Rate Reduction | 17.87% | 14.64%
Reduced Interest Rate | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 100.00% | 100.00%
Average Rate Reduction | 20.41% | 20.04%
Reduced Interest Rate | Consumer Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 20.00% | 37.00%
Average Rate Reduction | 3.36% | 3.88%
Reduced Interest Rate | Consumer Banking | Auto |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 20.00% | 37.00%
Average Rate Reduction | 3.34% | 3.83%
Reduced Interest Rate | Consumer Banking | Retail banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 1.00% | 15.00%
Average Rate Reduction | 12.50% | 13.01%
Reduced Interest Rate | Commercial Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 0.00% | 61.00%
Average Rate Reduction | 0.00% | 0.00%
Reduced Interest Rate | Commercial Banking | Total commercial lending |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity |  | 62.00%
Average Rate Reduction |  | 0.00%
Reduced Interest Rate | Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 0.00% | 100.00%
Average Rate Reduction | 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%
Average Rate Reduction | 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%
Average Rate Reduction |  | 0.00%
Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 46.00% | 24.00%
Average Term Extension (Months) | 6 months | 7 months
Term Extension | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 0.00% | 0.00%
Average Term Extension (Months) | 0 months | 0 months
Term Extension | Consumer Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 92.00% | 91.00%
Average Term Extension (Months) | 5 months | 7 months
Term Extension | Consumer Banking | Auto |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 94.00% | 91.00%
Average Term Extension (Months) | 5 months | 7 months
Term Extension | Consumer Banking | Retail banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 0.00% | 85.00%
Average Term Extension (Months) | 4 months | 6 months
Term Extension | Commercial Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 73.00% | 0.00%
Average Term Extension (Months) | 12 months | 0 months
Term Extension | Commercial Banking | Total commercial lending |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity |  | 0.00%
Average Term Extension (Months) |  | 0 months
Term Extension | Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 100.00% | 0.00%
Average Term Extension (Months) | 12 months | 0 months
Term Extension | Commercial Banking | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 0.00% | 0.00%
Average Term Extension (Months) | 0 months | 0 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
Domestic credit card: | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | $ 89 | $ 98
Domestic credit card: | Reduced Interest Rate | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 100.00% | 100.00%
Average Rate Reduction | 16.45% | 16.42%
Domestic credit card: | Term Extension | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 0.00% | 0.00%
Average Term Extension (Months) | 0 months | 0 months
International card businesses: | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | $ 51 | $ 47
International card businesses: | Reduced Interest Rate | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 100.00% | 100.00%
Average Rate Reduction | 27.32% | 27.59%
International card businesses: | Term Extension | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 0.00% | 0.00%
Average Term Extension (Months) | 0 months | 0 months

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