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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 312,251 | $ 314,735
Total | $ 323,598 | $ 327,775
Current, percentage of total loans | 96.49% | 96.02%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 1,300 | $ 1,200
Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 150,479 | 155,135
Total | 157,189 | 162,508
Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 74,579 | 72,837
Total | 78,896 | 78,092
Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 73,360 | 71,600
Total | 77,656 | 76,829
Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,219 | 1,237
Total | 1,240 | 1,263
Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 87,193 | 86,763
Total | 87,513 | 87,175
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 31,956 | 31,733
Total | 31,971 | 31,903
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 55,237 | 55,030
Total | 55,542 | 55,272
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 4,775 | $ 5,276
Delinquent Loans, percentage of total loans | 1.48% | 1.61%
30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 1,906 | $ 2,080
30-59 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,754 | 3,162
30-59 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 2,744 | 3,149
30-59 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 10 | 13
Total | 10 | 13
30-59 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 115 | 34
30-59 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1 | 31
30-59 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 114 | 3
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 2,663 | $ 3,138
Delinquent Loans, percentage of total loans | 0.82% | 0.96%
60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 1,434 | $ 1,575
60-89 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,181 | 1,532
60-89 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,176 | 1,529
60-89 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 5 | 3
Total | 5 | 3
60-89 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 48 | 31
60-89 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 0 | 9
60-89 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 48 | 22
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 3,909 | $ 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 | $ 3,370 | $ 3,718
Greater than 90 days | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 382 | 561
Greater than 90 days | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 376 | 551
Greater than 90 days | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 6 | 10
Total | 6 | 10
Greater than 90 days | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 157 | 347
Greater than 90 days | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 14 | 130
Greater than 90 days | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 143 | 217
Total Delinquent Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 11,347 | $ 13,040
Total Delinquent Loans, percentage of total loans | 3.51% | 3.98%
Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 6,710 | $ 7,373
Total Delinquent Loans | Consumer Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,317 | 5,255
Total Delinquent Loans | Consumer Banking: | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 4,296 | 5,229
Total Delinquent Loans | Consumer Banking: | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 21 | 26
Total Delinquent Loans | Commercial Banking: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 320 | 412
Total Delinquent Loans | Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 15 | 170
Total Delinquent Loans | Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 305 | 242
Domestic credit card: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 143,920 | 148,565
Total | 150,309 | 155,618
Domestic credit card: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,802 | 1,973
Total | 1,802 | 1,973
Domestic credit card: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 1,363 | 1,503
Total | 1,363 | 1,503
Domestic credit card: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 3,224 | 3,577
Total | 3,224 | 3,577
Domestic credit card: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 6,389 | 7,053
International card businesses: | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,559 | 6,570
Total | 6,880 | 6,890
International card businesses: | 30-59 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 104 | 107
Total | 104 | 107
International card businesses: | 60-89 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 71 | 72
Total | 71 | 72
International card businesses: | Greater than 90 days | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | 146 | 141
Total | 146 | 141
International card businesses: | Total Delinquent Loans | Credit Card: |  |
Financing Receivable, Past Due [Line Items] |  |
Delinquent Loans | $ 321 | $ 320

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