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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 299,290 | $ 302,305
Total | $ 308,836 | $ 312,331
Current, percentage of total loans | 96.91% | 96.79%
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 | 132,087 | 132,961
Total | 137,142 | 137,730
Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 73,883 | 74,985
Total | 78,151 | 79,925
Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 72,410 | 73,467
Total | 76,652 | 78,373
Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,473 | 1,518
Total | 1,499 | 1,552
Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 93,320 | 94,359
Total | 93,543 | 94,676
Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 37,096 | 37,417
Total | 37,132 | 37,453
Commercial Banking | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 56,224 | 56,942
Total | $ 56,411 | $ 57,223
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 1.40% | 1.50%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 4,309 | $ 4,666
30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,495 | 1,491
30-59 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,778 | 3,114
30-59 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,771 | 3,101
30-59 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 7 | 13
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 7 | 13
30-59 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 36 | 61
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 | 35 | 0
30-59 days | Commercial Banking | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 1 | $ 61
60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.74% | 0.80%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 2,293 | $ 2,511
60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,092 | 1,033
60-89 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,174 | 1,422
60-89 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,171 | 1,418
60-89 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 3 | 4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 3 | 4
60-89 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 27 | 56
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 | 0 | 1
60-89 days | Commercial Banking | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 27 | $ 55
Greater than 90 days |  |
Financing Receivable, Past Due [Line Items] |  |
Past due, percentage of total loans | 0.95% | 0.91%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 2,944 | $ 2,849
Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,468 | 2,245
Greater than 90 days | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 316 | 404
Greater than 90 days | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 300 | 387
Greater than 90 days | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 16 | 17
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 16 | 17
Greater than 90 days | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 160 | 200
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 | 1 | 35
Greater than 90 days | Commercial Banking | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 159 | $ 165
Total Delinquent Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past due total, percentage of total loans | 3.09% | 3.21%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 9,546 | $ 10,026
Total Delinquent Loans | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 5,055 | 4,769
Total Delinquent Loans | Consumer Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 4,268 | 4,940
Total Delinquent Loans | Consumer Banking | Auto |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 4,242 | 4,906
Total Delinquent Loans | Consumer Banking | Retail banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 26 | 34
Total Delinquent Loans | Commercial Banking |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 223 | 317
Total Delinquent Loans | Commercial Banking | Commercial and multifamily real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 36 | 36
Total Delinquent Loans | Commercial Banking | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 187 | 281
Domestic credit card: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 126,189 | 127,066
Total | 130,980 | 131,581
Domestic credit card: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,406 | 1,405
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,406 | 1,405
Domestic credit card: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,033 | 975
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 1,033 | 975
Domestic credit card: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,352 | 2,135
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 2,352 | 2,135
Domestic credit card: | Total Delinquent Loans | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 4,791 | 4,515
International card businesses: | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 5,898 | 5,895
Total | 6,162 | 6,149
International card businesses: | 30-59 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 89 | 86
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 89 | 86
International card businesses: | 60-89 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 59 | 58
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 59 | 58
International card businesses: | Greater than 90 days | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 116 | 110
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 116 | 110
International card businesses: | Total Delinquent Loans | Credit Card |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | $ 264 | $ 254

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