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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 295,506 | $ 270,655
Total | $ 303,943 | $ 277,340
Current, percentage of total loans | 97.22% | 97.59%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 1,400 | $ 1,400
Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 123,085 | 112,148
Total | 126,913 | 114,772
Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 76,909 | 74,028
Total | 81,199 | 77,646
Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 75,329 | 72,221
Total | 79,580 | 75,779
Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,580 | 1,807
Total | 1,619 | 1,867
Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 95,512 | 84,479
Total | 95,831 | 84,922
Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 38,056 | 35,100
Total | 38,225 | 35,262
Commercial Banking | Commercial And Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 57,456 | 49,379
Total | $ 57,606 | $ 49,660
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 1.39% | 1.26%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 4,230 | $ 3,501
30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,258 | 850
30-59 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,769 | 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 | 2,754 | 2,385
30-59 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 15 | 35
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 15 | 35
30-59 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 203 | 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 | 134 | 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 | $ 69 | $ 139
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.69% | 0.60%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 2,091 | $ 1,656
60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 870 | 578
60-89 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,207 | 940
60-89 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,202 | 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 | 14 | 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 | 1 | 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 | $ 13 | $ 103
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.70% | 0.55%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 2,116 | $ 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 | 1,700 | 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 | 314 | 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 | 295 | 240
Greater than 90 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 19 | 18
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 19 | 18
Greater than 90 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 102 | 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 | 34 | 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 | $ 68 | $ 39
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due total, percentage of total loans | 2.78% | 2.41%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 8,437 | $ 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 | 3,828 | 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 | 4,290 | 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 | 4,251 | 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 | 39 | 60
Financial Asset, Past Due | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 319 | 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 | 169 | 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 | 150 | 281
Domestic credit card: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 117,676 | 106,312
Total | 121,279 | 108,723
Domestic credit card: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,179 | 773
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,179 | 773
Domestic credit card: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 817 | 528
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 817 | 528
Domestic credit card: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,607 | 1,110
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,607 | 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 | 3,603 | 2,411
International card businesses: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 5,409 | 5,836
Total | 5,634 | 6,049
International card businesses: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 79 | 77
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 79 | 77
International card businesses: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 53 | 50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 53 | 50
International card businesses: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 93 | 86
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 93 | 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 | $ 225 | $ 213

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