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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 427,636 | $ 314,735
Total | $ 443,159 | $ 327,775
Current, percentage of total loans | 96.50% | 96.02%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 963 | $ 1,200
Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 260,620 | 155,135
Total | 271,037 | 162,508
Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 9,469 |
Total | 9,646 |
Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 78,628 | 72,837
Total | 83,230 | 78,092
Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 77,448 | 71,600
Total | 82,035 | 76,829
Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,180 | 1,237
Total | 1,195 | 1,263
Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 88,388 | 86,763
Total | 88,892 | 87,175
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 33,365 | 31,733
Total | 33,461 | 31,903
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 55,023 | 55,030
Total | 55,431 | 55,272
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 6,144 | $ 5,276
Delinquent Loans, percentage of total loans | 1.39% | 1.61%
30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,207 | $ 2,080
30-59 days | Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 72 |
30-59 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,909 | 3,162
30-59 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,898 | 3,149
30-59 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 11 | 13
Total | 11 | 13
30-59 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 28 | 34
30-59 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 19 | 31
30-59 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 9 | 3
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,750 | $ 3,138
Delinquent Loans, percentage of total loans | 0.84% | 0.96%
60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 2,334 | $ 1,575
60-89 days | Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 55 |
60-89 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,292 | 1,532
60-89 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,290 | 1,529
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 | 124 | 31
60-89 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1 | 9
60-89 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 123 | 22
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 5,629 | $ 4,626
Delinquent Loans, percentage of total loans | 1.27% | 1.41%
Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 4,876 | $ 3,718
Greater than 90 days | Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 50 |
Greater than 90 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 401 | 561
Greater than 90 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 399 | 551
Greater than 90 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2 | 10
Total | 2 | 10
Greater than 90 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 352 | 347
Greater than 90 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 76 | 130
Greater than 90 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 276 | 217
Total Delinquent Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 15,523 | $ 13,040
Total Delinquent Loans, percentage of total loans | 3.50% | 3.98%
Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 10,417 | $ 7,373
Total Delinquent Loans | Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 177 |
Total Delinquent Loans | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,602 | 5,255
Total Delinquent Loans | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,587 | 5,229
Total Delinquent Loans | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 15 | 26
Total Delinquent Loans | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 504 | 412
Total Delinquent Loans | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 96 | 170
Total Delinquent Loans | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 408 | 242
Domestic credit card: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 244,063 |
Delinquent Loans |  | 148,565
Total | 253,951 | 155,618
Domestic credit card: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3,015 | 1,973
Total | 3,015 | 1,973
Domestic credit card: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,198 | 1,503
Total | 2,198 | 1,503
Domestic credit card: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,675 | 3,577
Total | 4,675 | 3,577
Domestic credit card: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 9,888 | 7,053
International card businesses: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 7,088 | 6,570
Total | 7,440 | 6,890
International card businesses: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 120 | 107
Total | 120 | 107
International card businesses: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 81 | 72
Total | 81 | 72
International card businesses: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 151 | 141
Total | 151 | 141
International card businesses: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 352 | $ 320

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