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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 495 | $ 179 | $ 1,629 | $ 601
Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 106 | $ 65 | $ 289 | $ 208
Credit Card | Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 19.77% | 20.90% | 19.63% | 21.26%
Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 276 | $ 89 | $ 796 | $ 270
Consumer Banking | Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 64.00% | 48.00% | 56.00% | 40.00%
Average Rate Reduction | 8.45% | 8.54% | 8.59% | 8.72%
Consumer Banking | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 97.00% | 92.00% | 97.00% | 93.00%
Average Term Extension (Months) | 5 months | 4 months | 4 months | 4 months
Consumer Banking | Principal Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivables, Impaired, Write-down Percentage of Troubled Debt Restructuring Activity |  |  |  | 0.00%
Gross Balance Reduction |  |  |  | $ 1
Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 275 | $ 89 | $ 794 | $ 269
Consumer Banking | Auto | Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 64.00% | 48.00% | 56.00% | 40.00%
Average Rate Reduction | 8.45% | 8.54% | 8.59% | 8.74%
Consumer Banking | Auto | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 97.00% | 92.00% | 97.00% | 93.00%
Average Term Extension (Months) | 5 months | 4 months | 4 months | 4 months
Consumer Banking | Auto | Principal Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivables, Impaired, Write-down Percentage of Troubled Debt Restructuring Activity |  |  |  | 0.00%
Gross Balance Reduction |  |  |  | $ 1
Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 1 |  | $ 2 | $ 1
Consumer Banking | Retail banking | Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity |  |  |  | 20.00%
Average Rate Reduction |  |  |  | 2.55%
Consumer Banking | Retail banking | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 60.00% |  | 76.00% | 36.00%
Average Term Extension (Months) | 14 months |  | 13 months | 67 months
Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 113 | $ 25 | $ 544 | $ 123
Commercial Banking | Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 20.00% | 12.00% | 6.00% | 2.00%
Average Rate Reduction | 0.78% | 2.50% | 0.35% | 1.29%
Commercial Banking | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 99.00% | 100.00% | 72.00% | 61.00%
Average Term Extension (Months) | 15 months | 11 months | 13 months | 11 months
Commercial Banking | Commercial and multifamily real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 38 | $ 21 | $ 302 | $ 41
Commercial Banking | Commercial and multifamily real estate | Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 58.00% | 14.00% | 10.00% | 7.00%
Average Rate Reduction | 0.78% | 2.50% | 0.35% | 1.29%
Commercial Banking | Commercial and multifamily real estate | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 100.00% | 80.00% | 100.00%
Average Term Extension (Months) | 11 months | 12 months | 13 months | 13 months
Commercial Banking | Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 75 | $ 4 | $ 242 | $ 82
Commercial Banking | Commercial And Industrial [Member] | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 98.00% | 100.00% | 62.00% | 41.00%
Average Term Extension (Months) | 17 months | 4 months | 14 months | 8 months
Domestic credit card: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 77 | $ 37 | $ 196 | $ 114
Domestic credit card: | Credit Card | Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 16.79% | 15.80% | 15.76% | 16.00%
International card businesses: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Loans Modified | $ 29 | $ 28 | $ 93 | $ 94
International card businesses: | Credit Card | Reduced Interest Rate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
% of TDR Activity | 100.00% | 100.00% | 100.00% | 100.00%
Average Rate Reduction | 27.52% | 27.75% | 27.73% | 27.66%

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