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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 424,725 | $ 314,735
Total | $ 439,297 | $ 327,775
Current, percentage of total loans | 96.68% | 96.02%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 946 | $ 1,200
Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 260,119 | 155,135
Total | 269,709 | 162,508
Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 9,622 |
Total | 9,788 |
Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 76,847 | 72,837
Total | 81,233 | 78,092
Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 75,647 | 71,600
Total | 80,017 | 76,829
Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,200 | 1,237
Total | 1,216 | 1,263
Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 87,759 | 86,763
Total | 88,355 | 87,175
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 32,757 | 31,733
Total | 32,967 | 31,903
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 55,002 | 55,030
Total | 55,388 | 55,272
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 5,706 | $ 5,276
Delinquent Loans, percentage of total loans | 1.30% | 1.61%
30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 2,888 | $ 2,080
30-59 days | Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 67 |
30-59 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,691 | 3,162
30-59 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,680 | 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 | 127 | 34
30-59 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 126 | 31
30-59 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1 | 3
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,547 | $ 3,138
Delinquent Loans, percentage of total loans | 0.81% | 0.96%
60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 2,111 | $ 1,575
60-89 days | Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 53 |
60-89 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,283 | 1,532
60-89 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,281 | 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 | 153 | 31
60-89 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 84 | 9
60-89 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 69 | 22
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 5,319 | $ 4,626
Delinquent Loans, percentage of total loans | 1.21% | 1.41%
Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 4,591 | $ 3,718
Greater than 90 days | Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 46 |
Greater than 90 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 412 | 561
Greater than 90 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 409 | 551
Greater than 90 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3 | 10
Total | 3 | 10
Greater than 90 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 316 | 347
Greater than 90 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 0 | 130
Greater than 90 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 316 | 217
Total Delinquent Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 14,572 | $ 13,040
Total Delinquent Loans, percentage of total loans | 3.32% | 3.98%
Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 9,590 | $ 7,373
Total Delinquent Loans | Credit Card: | Personal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 166 |
Total Delinquent Loans | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,386 | 5,255
Total Delinquent Loans | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,370 | 5,229
Total Delinquent Loans | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 16 | 26
Total Delinquent Loans | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 596 | 412
Total Delinquent Loans | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 210 | 170
Total Delinquent Loans | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 386 | 242
Domestic credit card: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 243,401 | 148,565
Total | 252,481 | 155,618
Domestic credit card: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,702 | 1,973
Total | 2,702 | 1,973
Domestic credit card: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,985 | 1,503
Total | 1,985 | 1,503
Domestic credit card: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,393 | 3,577
Total | 4,393 | 3,577
Domestic credit card: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 9,080 | 7,053
International card businesses: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 7,096 | 6,570
Total | 7,440 | 6,890
International card businesses: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 119 | 107
Total | 119 | 107
International card businesses: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 73 | 72
Total | 73 | 72
International card businesses: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 152 | 141
Total | 152 | 141
International card businesses: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 344 | $ 320

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