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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 307,794 | $ 307,695
Total | $ 320,243 | $ 320,472
Current, percentage of total loans | 96.11% | 96.01%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 1,300 | $ 1,400
Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 149,547 | 147,412
Total | 156,651 | 154,547
Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 71,911 | 70,097
Total | 76,758 | 75,437
Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 70,682 | 68,768
Total | 75,505 | 74,075
Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,229 | 1,329
Total | 1,253 | 1,362
Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 86,336 | 90,186
Total | 86,834 | 90,488
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 32,016 | 34,325
Total | 32,199 | 34,446
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 54,320 | 55,861
Total | 54,635 | 56,042
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 5,234 | $ 5,367
Delinquent Loans, percentage of total loans | 1.64% | 1.68%
30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 2,098 | $ 2,084
30-59 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,908 | 3,283
30-59 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,895 | 3,268
30-59 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 13 | 15
Total | 13 | 15
30-59 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 228 | 0
30-59 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 114 | 0
30-59 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 114 | 0
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,072 | $ 3,119
Delinquent Loans, percentage of total loans | 0.96% | 0.97%
60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 1,544 | $ 1,547
60-89 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,454 | 1,558
60-89 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,452 | 1,555
60-89 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2 | 3
Total | 2 | 3
60-89 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 74 | 14
60-89 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 20 | 14
60-89 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 54 | 0
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 4,143 | $ 4,291
Delinquent Loans, percentage of total loans | 1.29% | 1.34%
Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,462 | $ 3,504
Greater than 90 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 485 | 499
Greater than 90 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 476 | 484
Greater than 90 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 9 | 15
Total | 9 | 15
Greater than 90 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 196 | 288
Greater than 90 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 49 | 107
Greater than 90 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 147 | 181
Total Delinquent Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 12,449 | $ 12,777
Total Delinquent Loans, percentage of total loans | 3.89% | 3.99%
Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 7,104 | $ 7,135
Total Delinquent Loans | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,847 | 5,340
Total Delinquent Loans | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,823 | 5,307
Total Delinquent Loans | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 24 | 33
Total Delinquent Loans | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 498 | 302
Total Delinquent Loans | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 183 | 121
Total Delinquent Loans | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 315 | 181
Domestic credit card: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 142,633 | 140,860
Total | 149,400 | 147,666
Domestic credit card: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,982 | 1,968
Total | 1,982 | 1,968
Domestic credit card: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,469 | 1,471
Total | 1,469 | 1,471
Domestic credit card: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3,316 | 3,367
Total | 3,316 | 3,367
Domestic credit card: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 6,767 | 6,806
International card businesses: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,914 | 6,552
Total | 7,251 | 6,881
International card businesses: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 116 | 116
Total | 116 | 116
International card businesses: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 75 | 76
Total | 75 | 76
International card businesses: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 146 | 137
Total | 146 | 137
International card businesses: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 337 | $ 329

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