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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 270,655 | $ 245,060
Total | $ 277,340 | $ 251,624
Current, percentage of total loans | 97.59% | 97.39%
Percentage of total loans | 100.00% | 100.00%
Unamortized premiums and discounts, deferred fees and costs | $ 1,400 | $ 1,100
Accrued interest receivable | 1,200 | 1,200
Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 112,148 | 104,334
Total | 114,772 | 106,956
Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 74,028 | 65,445
Total | 77,646 | 68,888
Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 72,221 | 62,381
Total | 75,779 | 65,762
Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,807 | 3,064
Total | 1,867 | 3,126
Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 84,479 | 75,281
Total | 84,922 | 75,780
Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 35,100 | 30,340
Total | 35,262 | 30,681
Commercial Banking | Commercial And Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 49,379 | 44,941
Total | $ 49,660 | $ 45,099
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 1.26% | 1.32%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 3,501 | $ 3,330
30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 850 | 845
30-59 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,420 | 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 | 2,385 | 2,252
30-59 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 35 | 28
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 35 | 28
30-59 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 231 | 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 | 92 | 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 | $ 139 | $ 69
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.60% | 0.59%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 1,656 | $ 1,485
60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 578 | 522
60-89 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 940 | 926
60-89 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 933 | 907
60-89 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 7 | 19
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 7 | 19
60-89 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 138 | 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 | 35 | 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 | $ 103 | $ 15
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.55% | 0.70%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 1,528 | $ 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 | 1,196 | 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 | 258 | 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 | 240 | 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 | 74 | 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 | 35 | 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 | $ 39 | $ 74
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due total, percentage of total loans | 2.41% | 2.61%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 6,685 | $ 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 | 2,624 | 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 | 3,618 | 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 | 3,558 | 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 | 60 | 62
Financial Asset, Past Due | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 443 | 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 | 162 | 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 | 281 | 158
Domestic credit card: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 106,312 | 96,116
Total | 108,723 | 98,504
Domestic credit card: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 773 | 755
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 773 | 755
Domestic credit card: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 528 | 464
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 528 | 464
Domestic credit card: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,110 | 1,169
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,110 | 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 | 2,411 | 2,388
International card businesses: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 5,836 | 8,218
Total | 6,049 | 8,452
International card businesses: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 77 | 90
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 77 | 90
International card businesses: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 50 | 58
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 50 | 58
International card businesses: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 86 | 86
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 86 | 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 | $ 213 | $ 234

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