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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | $ 1,700 |  | $ 1,700 |  | $ 1,195
Nonperforming Loans | 1,075 |  | 1,075 |  | 1,100
Nonperforming Loans Without an Allowance | $ 424 |  | $ 424 |  | $ 529
Percentage, 90 Days Past Due and Accruing | 0.56% |  | 0.56% |  | 0.43%
Percentage, Nonperforming Loans | 0.35% |  | 0.35% |  | 0.40%
Percentage, Nonperforming Loans Without an Allowance | 0.14% |  | 0.14% |  | 0.19%
Interest income for loans classified as nonperforming | $ 2 | $ 1 | $ 29 | $ 21 |
Credit Card |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 1,697 |  | 1,697 |  | $ 1,192
Nonperforming Loans | 8 |  | 8 |  | 10
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 | 1,607 |  | 1,607 |  | 1,110
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 | 90 |  | 90 |  | 82
Nonperforming Loans | 8 |  | 8 |  | 10
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 | 517 |  | 517 |  | 391
Nonperforming Loans Without an Allowance | 5 |  | 5 |  | 4
Consumer Banking | Auto |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 474 |  | 474 |  | 344
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 | 43 |  | 43 |  | 47
Nonperforming Loans Without an Allowance | 5 |  | 5 |  | 4
Commercial Banking |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 3 |  | 3 |  | 3
Nonperforming Loans | 550 |  | 550 |  | 699
Nonperforming Loans Without an Allowance | 419 |  | 419 |  | 525
Commercial Banking | Commercial and multifamily real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 3 |  | 3 |  | 3
Nonperforming Loans | 243 |  | 243 |  | 383
Nonperforming Loans Without an Allowance | 219 |  | 219 |  | 268
Commercial Banking | Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 307 |  | 307 |  | 316
Nonperforming Loans Without an Allowance | $ 200 |  | $ 200 |  | $ 257

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