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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 274,269 | $ 270,655
Total | $ 280,466 | $ 277,340
Current, percentage of total loans | 97.79% | 97.59%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 1,400 | $ 1,400
Accrued interest receivable | 1,300 | 1,200
Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 111,240 | 112,148
Total | 113,962 | 114,772
Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 77,011 | 74,028
Total | 80,330 | 77,646
Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 75,319 | 72,221
Total | 78,604 | 75,779
Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,692 | 1,807
Total | 1,726 | 1,867
Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 86,018 | 84,479
Total | 86,174 | 84,922
Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 34,272 | 35,100
Total | 34,354 | 35,262
Commercial Banking | Commercial And Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 51,746 | 49,379
Total | $ 51,820 | $ 49,660
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 1.13% | 1.26%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 3,152 | $ 3,501
30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 829 | 850
30-59 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,277 | 2,420
30-59 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,268 | 2,385
30-59 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 9 | 35
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 9 | 35
30-59 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 46 | 231
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 | 31 | 92
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 | $ 15 | $ 139
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.51% | 0.60%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 1,442 | $ 1,656
60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 608 | 578
60-89 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 817 | 940
60-89 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 812 | 933
60-89 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 5 | 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 5 | 7
60-89 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 17 | 138
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 | 9 | 35
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 | $ 8 | $ 103
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.57% | 0.55%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 1,603 | $ 1,528
Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,285 | 1,196
Greater than 90 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 225 | 258
Greater than 90 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 205 | 240
Greater than 90 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 20 | 18
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 20 | 18
Greater than 90 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 93 | 74
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 | 42 | 35
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 | $ 51 | $ 39
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due total, percentage of total loans | 2.21% | 2.41%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 6,197 | $ 6,685
Financial Asset, Past Due | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,722 | 2,624
Financial Asset, Past Due | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 3,319 | 3,618
Financial Asset, Past Due | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 3,285 | 3,558
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 | 34 | 60
Financial Asset, Past Due | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 156 | 443
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 | 82 | 162
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 | 74 | 281
Domestic credit card: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 105,484 | 106,312
Total | 107,987 | 108,723
Domestic credit card: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 754 | 773
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 754 | 773
Domestic credit card: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 558 | 528
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 558 | 528
Domestic credit card: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,191 | 1,110
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,191 | 1,110
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 | 2,503 | 2,411
International card businesses: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 5,756 | 5,836
Total | 5,975 | 6,049
International card businesses: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 75 | 77
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 75 | 77
International card businesses: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 50 | 50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 50 | 50
International card businesses: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 94 | 86
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 94 | 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 | $ 219 | $ 213

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