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Loans - 90+ Day Delinquent Loans Accruing Interest and Nonperforming Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | $ 3,148 |  | $ 3,148 |  | $ 3,554
Nonperforming Loans | 1,998 |  | 1,998 |  | 1,528
Nonperforming Loans Without an Allowance | $ 765 |  | $ 765 |  | $ 547
Percentage, 90 Days Past Due and Accruing | 0.99% |  | 0.99% |  | 1.11%
Percentage, Nonperforming Loans | 0.63% |  | 0.63% |  | 0.48%
Percentage, Nonperforming Loans Without an Allowance | 0.24% |  | 0.24% |  | 0.17%
Interest income for loans classified as nonperforming | $ 6 | $ 5 | $ 31 | $ 17 |
Credit Card: |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 3,102 |  | 3,102 |  | $ 3,499
Nonperforming Loans | 10 |  | 10 |  | 9
Nonperforming Loans Without an Allowance | 0 |  | 0 |  | 0
Credit Card: | Domestic credit card: |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 2,967 |  | 2,967 |  | 3,367
Nonperforming Loans Without an Allowance | 0 |  | 0 |  | 0
Credit Card: | International card businesses: |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 135 |  | 135 |  | 132
Nonperforming Loans | 10 |  | 10 |  | 9
Nonperforming Loans Without an Allowance | 0 |  | 0 |  | 0
Consumer Banking: |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 694 |  | 694 |  | 758
Nonperforming Loans Without an Allowance | 20 |  | 20 |  | 19
Consumer Banking: | Auto |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 658 |  | 658 |  | 712
Nonperforming Loans Without an Allowance | 0 |  | 0 |  | 0
Consumer Banking: | Retail banking |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 36 |  | 36 |  | 46
Nonperforming Loans Without an Allowance | 20 |  | 20 |  | 19
Commercial Banking: |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 46 |  | 46 |  | 55
Nonperforming Loans | 1,294 |  | 1,294 |  | 761
Nonperforming Loans Without an Allowance | 745 |  | 745 |  | 528
Commercial Banking: | Commercial and multifamily real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 422 |  | 422 |  | 425
Nonperforming Loans Without an Allowance | 321 |  | 321 |  | 335
Commercial Banking: | Commercial and industrial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
> 90 Days and Accruing | 46 |  | 46 |  | 55
Nonperforming Loans | 872 |  | 872 |  | 336
Nonperforming Loans Without an Allowance | $ 424 |  | $ 424 |  | $ 193

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