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Loans - 90+ Day Delinquent Loans Accruing Interest and Nonperforming Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | $ 922 |  | $ 922 |  | $ 1,302
Nonperforming Loans | 933 |  | 933 |  | 995
Nonperforming Loans Without an Allowance | $ 517 |  | $ 517 |  | $ 449
Percentage, 90 Days Past Due and Accruing | 0.35% |  | 0.35% |  | 0.52%
Percentage, Nonperforming Loans | 0.35% |  | 0.35% |  | 0.40%
Percentage, Nonperforming Loans Without an Allowance | 0.20% |  | 0.20% |  | 0.18%
Interest income for loans classified as nonperforming | $ 1 | $ 4 | $ 21 | $ 22 |
Credit Card |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 915 |  | 915 |  | $ 1,251
Nonperforming Loans | 9 |  | 9 |  | 21
Nonperforming Loans Without an Allowance | 0 |  | 0 |  | 0
Credit Card | Domestic credit card: |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 841 |  | 841 |  | 1,169
Nonperforming Loans Without an Allowance | 0 |  | 0 |  | 0
Credit Card | International card businesses: |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 74 |  | 74 |  | 82
Nonperforming Loans | 9 |  | 9 |  | 21
Nonperforming Loans Without an Allowance | 0 |  | 0 |  | 0
Consumer Banking |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 323 |  | 323 |  | 324
Nonperforming Loans Without an Allowance | 19 |  | 19 |  | 0
Consumer Banking | Auto |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 270 |  | 270 |  | 294
Nonperforming Loans Without an Allowance | 0 |  | 0 |  | 0
Consumer Banking | Retail banking |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 53 |  | 53 |  | 30
Nonperforming Loans Without an Allowance | 19 |  | 19 |  | 0
Commercial Banking |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 7 |  | 7 |  | 51
Nonperforming Loans | 601 |  | 601 |  | 650
Nonperforming Loans Without an Allowance | 498 |  | 498 |  | 449
Commercial Banking | Commercial and multifamily real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 0 |  | 0 |  | 51
Nonperforming Loans | 287 |  | 287 |  | 200
Nonperforming Loans Without an Allowance | 265 |  | 265 |  | 184
Commercial Banking | Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 7 |  | 7 |  | 0
Nonperforming Loans | 314 |  | 314 |  | 450
Nonperforming Loans Without an Allowance | $ 233 |  | $ 233 |  | $ 265

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