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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 314,735 | $ 307,695
Total | $ 327,775 | $ 320,472
Current, percentage of total loans | 96.02% | 96.01%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 1,200 | $ 1,400
Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 155,135 | 147,412
Total | 162,508 | 154,547
Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 72,837 | 70,097
Total | 78,092 | 75,437
Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 71,600 | 68,768
Total | 76,829 | 74,075
Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,237 | 1,329
Total | 1,263 | 1,362
Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 86,763 | 90,186
Total | 87,175 | 90,488
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 31,733 | 34,325
Total | 31,903 | 34,446
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 55,030 | 55,861
Total | 55,272 | 56,042
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 5,276 | $ 5,367
Delinquent Loans, percentage of total loans | 1.61% | 1.68%
30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 2,080 | $ 2,084
30-59 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3,162 | 3,283
30-59 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3,149 | 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 | 34 | 0
30-59 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 31 | 0
30-59 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3 | 0
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,138 | $ 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 | $ 1,575 | $ 1,547
60-89 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,532 | 1,558
60-89 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,529 | 1,555
60-89 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3 | 3
Total | 3 | 3
60-89 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 31 | 14
60-89 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 9 | 14
60-89 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 22 | 0
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 4,626 | $ 4,291
Delinquent Loans, percentage of total loans | 1.41% | 1.34%
Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,718 | $ 3,504
Greater than 90 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 561 | 499
Greater than 90 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 551 | 484
Greater than 90 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 10 | 15
Total | 10 | 15
Greater than 90 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 347 | 288
Greater than 90 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 130 | 107
Greater than 90 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 217 | 181
Total Delinquent Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 13,040 | $ 12,777
Total Delinquent Loans, percentage of total loans | 3.98% | 3.99%
Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 7,373 | $ 7,135
Total Delinquent Loans | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 5,255 | 5,340
Total Delinquent Loans | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 5,229 | 5,307
Total Delinquent Loans | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 26 | 33
Total Delinquent Loans | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 412 | 302
Total Delinquent Loans | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 170 | 121
Total Delinquent Loans | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 242 | 181
Domestic credit card: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 148,565 | 140,860
Total | 155,618 | 147,666
Domestic credit card: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,973 | 1,968
Total | 1,973 | 1,968
Domestic credit card: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,503 | 1,471
Total | 1,503 | 1,471
Domestic credit card: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3,577 | 3,367
Total | 3,577 | 3,367
Domestic credit card: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 7,053 | 6,806
International card businesses: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,570 | 6,552
Total | 6,890 | 6,881
International card businesses: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 107 | 116
Total | 107 | 116
International card businesses: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 72 | 76
Total | 72 | 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 | $ 320 | $ 329

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