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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 255,823 | $ 245,060
Total | $ 261,390 | $ 251,624
Current, percentage of total loans | 97.87% | 97.39%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 1,400 | $ 1,100
Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 102,925 | 104,334
Total | 105,030 | 106,956
Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 74,117 | 65,445
Total | 77,112 | 68,888
Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 71,770 | 62,381
Total | 74,716 | 65,762
Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,347 | 3,064
Total | 2,396 | 3,126
Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 78,781 | 75,281
Total | 79,248 | 75,780
Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 32,973 | 30,340
Total | 33,096 | 30,681
Commercial Banking | Commercial And Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 45,808 | 44,941
Total | $ 46,152 | $ 45,099
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 1.14% | 1.32%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 2,993 | $ 3,330
30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 718 | 845
30-59 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,022 | 2,280
30-59 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,996 | 2,252
30-59 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 26 | 28
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 26 | 28
30-59 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 253 | 205
30-59 days | Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 72 | 136
30-59 days | Commercial Banking | Commercial And Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 181 | $ 69
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.53% | 0.59%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 1,379 | $ 1,485
60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 470 | 522
60-89 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 774 | 926
60-89 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 769 | 907
60-89 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 5 | 19
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 5 | 19
60-89 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 135 | 37
60-89 days | Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1 | 22
60-89 days | Commercial Banking | Commercial And Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 134 | $ 15
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.46% | 0.70%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 1,195 | $ 1,749
Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 917 | 1,255
Greater than 90 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 199 | 237
Greater than 90 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 181 | 222
Greater than 90 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 18 | 15
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 18 | 15
Greater than 90 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 79 | 257
Greater than 90 days | Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 50 | 183
Greater than 90 days | Commercial Banking | Commercial And Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 29 | $ 74
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due total, percentatge of total loans | 2.13% | 2.61%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 5,567 | $ 6,564
Financial Asset, Past Due | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,105 | 2,622
Financial Asset, Past Due | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,995 | 3,443
Financial Asset, Past Due | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,946 | 3,381
Financial Asset, Past Due | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 49 | 62
Financial Asset, Past Due | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 467 | 499
Financial Asset, Past Due | Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 123 | 341
Financial Asset, Past Due | Commercial Banking | Commercial And Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 344 | 158
Domestic credit card: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 97,346 | 96,116
Total | 99,258 | 98,504
Domestic credit card: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 646 | 755
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 646 | 755
Domestic credit card: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 425 | 464
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 425 | 464
Domestic credit card: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 841 | 1,169
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 841 | 1,169
Domestic credit card: | Financial Asset, Past Due | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,912 | 2,388
International card businesses: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 5,579 | 8,218
Total | 5,772 | 8,452
International card businesses: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 72 | 90
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 72 | 90
International card businesses: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 45 | 58
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 45 | 58
International card businesses: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 76 | 86
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 76 | 86
International card businesses: | Financial Asset, Past Due | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 193 | $ 234

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