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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 306,641 | $ 307,695
Total | $ 318,186 | $ 320,472
Current, percentage of total loans | 96.37% | 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 | 147,484 | 147,412
Total | 153,895 | 154,547
Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 70,858 | 70,097
Total | 75,663 | 75,437
Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 69,615 | 68,768
Total | 74,385 | 74,075
Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,243 | 1,329
Total | 1,278 | 1,362
Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 88,299 | 90,186
Total | 88,628 | 90,488
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 32,643 | 34,325
Total | 32,832 | 34,446
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 55,656 | 55,861
Total | 55,796 | 56,042
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 4,808 | $ 5,367
Delinquent Loans, percentage of total loans | 1.51% | 1.68%
30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 1,884 | $ 2,084
30-59 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,895 | 3,283
30-59 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,873 | 3,268
30-59 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 22 | 15
Total | 22 | 15
30-59 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 29 | 0
30-59 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 21 | 0
30-59 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 8 | 0
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 2,890 | $ 3,119
Delinquent Loans, percentage of total loans | 0.91% | 0.97%
60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 1,419 | $ 1,547
60-89 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,466 | 1,558
60-89 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,462 | 1,555
60-89 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4 | 3
Total | 4 | 3
60-89 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 5 | 14
60-89 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 5 | 14
60-89 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 0 | 0
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,847 | $ 4,291
Delinquent Loans, percentage of total loans | 1.21% | 1.34%
Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,108 | $ 3,504
Greater than 90 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 444 | 499
Greater than 90 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 435 | 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 | 295 | 288
Greater than 90 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 163 | 107
Greater than 90 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 132 | 181
Total Delinquent Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 11,545 | $ 12,777
Total Delinquent Loans, percentage of total loans | 3.63% | 3.99%
Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 6,411 | $ 7,135
Total Delinquent Loans | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,805 | 5,340
Total Delinquent Loans | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,770 | 5,307
Total Delinquent Loans | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 35 | 33
Total Delinquent Loans | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 329 | 302
Total Delinquent Loans | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 189 | 121
Total Delinquent Loans | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 140 | 181
Domestic credit card: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 140,978 | 140,860
Total | 147,065 | 147,666
Domestic credit card: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,770 | 1,968
Total | 1,770 | 1,968
Domestic credit card: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,350 | 1,471
Total | 1,350 | 1,471
Domestic credit card: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,967 | 3,367
Total | 2,967 | 3,367
Domestic credit card: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 6,087 | 6,806
International card businesses: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,506 | 6,552
Total | 6,830 | 6,881
International card businesses: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 114 | 116
Total | 114 | 116
International card businesses: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 69 | 76
Total | 69 | 76
International card businesses: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 141 | 137
Total | 141 | 137
International card businesses: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 324 | $ 329

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