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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | $ 262 | $ 292
Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 83 | 140
Consumer Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 115 | 126
Consumer Banking | Auto |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 115 | 123
Consumer Banking | Retail banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified |  | 3
Commercial Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 64 | 26
Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | 20 | 19
Commercial Banking | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | $ 44 | $ 7
Reduced Interest Rate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 47.00% | 56.00%
Average Rate Reduction | 33.62% | 17.87%
Reduced Interest Rate | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 100.00% | 100.00%
Average Rate Reduction | 21.58% | 20.41%
Reduced Interest Rate | Consumer Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 35.00% | 20.00%
Average Rate Reduction | 9.02% | 3.36%
Reduced Interest Rate | Consumer Banking | Auto |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 35.00% | 20.00%
Average Rate Reduction | 9.02% | 3.34%
Reduced Interest Rate | Consumer Banking | Retail banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity |  | 1.00%
Average Rate Reduction |  | 12.50%
Reduced Interest Rate | Commercial Banking |  |
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 | Commercial and multifamily real estate |  |
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 | Commercial and industrial |  |
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 | 54.00% | 46.00%
Average Term Extension (Months) | 5 months | 6 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 | 95.00% | 92.00%
Average Term Extension (Months) | 3 months | 5 months
Term Extension | Consumer Banking | Auto |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 95.00% | 94.00%
Average Term Extension (Months) | 3 months | 5 months
Term Extension | Consumer Banking | Retail banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity |  | 0.00%
Average Term Extension (Months) |  | 4 months
Term Extension | Commercial Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 48.00% | 73.00%
Average Term Extension (Months) | 10 months | 12 months
Term Extension | Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 100.00% | 100.00%
Average Term Extension (Months) | 14 months | 12 months
Term Extension | Commercial Banking | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
% of TDR Activity | 25.00% | 0.00%
Average Term Extension (Months) | 2 months | 0 months
Domestic credit card: | Credit Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans Modified | $ 44 | $ 89
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 | 16.12% | 16.45%
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 | $ 39 | $ 51
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 | 27.74% | 27.32%
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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