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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | $ 823 |  | $ 823 |  | $ 1,302
Nonperforming Loans | 1,033 |  | 1,033 |  | 995
Nonperforming Loans Without an Allowance | $ 549 |  | $ 549 |  | $ 449
Percentage, 90 Days Past Due and Accruing | 0.30% |  | 0.30% |  | 0.50%
Percentage, Nonperforming Loans | 0.40% |  | 0.40% |  | 0.40%
Percentage, Nonperforming Loans Without an Allowance | 0.20% |  | 0.20% |  | 0.20%
Interest income for loans classified as nonperforming | $ 3 | $ 5 | $ 8 | $ 11 |
Credit Card |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 821 |  | 821 |  | $ 1,251
Nonperforming Loans | 12 |  | 12 |  | 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 | 756 |  | 756 |  | 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 | 65 |  | 65 |  | 82
Nonperforming Loans | 12 |  | 12 |  | 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 | 262 |  | 262 |  | 324
Nonperforming Loans Without an Allowance | 20 |  | 20 |  | 0
Consumer Banking | Auto |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 209 |  | 209 |  | 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 | 20 |  | 20 |  | 0
Commercial Banking |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 2 |  | 2 |  | 51
Nonperforming Loans | 759 |  | 759 |  | 650
Nonperforming Loans Without an Allowance | 529 |  | 529 |  | 449
Commercial Banking | Commercial and multifamily real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 2 |  | 2 |  | 51
Nonperforming Loans | 301 |  | 301 |  | 200
Nonperforming Loans Without an Allowance | 249 |  | 249 |  | 184
Commercial Banking | Commercial and industrial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
90 Days Past Due and Accruing | 0 |  | 0 |  | 0
Nonperforming Loans | 458 |  | 458 |  | 450
Nonperforming Loans Without an Allowance | $ 280 |  | $ 280 |  | $ 265

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