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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | $ 238,321 | $ 245,060 |
Past due | 4,810 | 6,564 |
Total Loans | $ 243,131 | $ 251,624 | $ 262,990
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Current, percentage of total loans | 98.02% | 97.39% |
Past due, percentage of total loans | 1.98% | 2.61% |
Percentage of total loans | 100.00% | 100.00% |
Unamortized premiums and discounts, deferred fees and costs | $ 1,100 | $ 1,100 |
Accrued interest receivable | 1,100 | 1,200 |
Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 96,878 | 104,334 |
Past due | 2,249 | 2,622 |
Total Loans | 99,127 | 106,956 |
Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 67,919 | 65,445 |
Past due | 2,283 | 3,443 |
Total Loans | 70,202 | 68,888 |
Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 64,828 | 62,381 |
Past due | 2,231 | 3,381 |
Total Loans | 67,059 | 65,762 |
Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 3,091 | 3,064 |
Past due | 52 | 62 |
Total Loans | 3,143 | 3,126 |
Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 73,524 | 75,281 |
Past due | 278 | 499 |
Total Loans | 73,802 | 75,780 |
Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 29,854 | 30,340 |
Past due | 154 | 341 |
Total Loans | 30,008 | 30,681 |
Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 43,670 | 44,941 |
Past due | 124 | 158 |
Total Loans | 43,794 | 45,099 |
30-59 days |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 2,272 | $ 3,330 |
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Past due, percentage of total loans | 0.94% | 1.32% |
30-59 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 598 | $ 845 |
30-59 days | Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 1,593 | 2,280 |
30-59 days | Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 1,565 | 2,252 |
30-59 days | Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 28 | 28 |
Total Loans | 28 | 28 |
30-59 days | Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 81 | 205 |
30-59 days | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 38 | 136 |
30-59 days | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 43 | 69 |
60-89 days |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 999 | $ 1,485 |
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Past due, percentage of total loans | 0.41% | 0.59% |
60-89 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 440 | $ 522 |
60-89 days | Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 553 | 926 |
60-89 days | Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 545 | 907 |
60-89 days | Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 8 | 19 |
Total Loans | 8 | 19 |
60-89 days | Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 6 | 37 |
60-89 days | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 0 | 22 |
60-89 days | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 6 | 15 |
Greater than 90 days |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 1,539 | $ 1,749 |
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Past due, percentage of total loans | 0.63% | 0.70% |
Greater than 90 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 1,211 | $ 1,255 |
Greater than 90 days | Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 137 | 237 |
Greater than 90 days | Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 121 | 222 |
Greater than 90 days | Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 16 | 15 |
Total Loans | 16 | 15 |
Greater than 90 days | Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 191 | 257 |
Greater than 90 days | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 116 | 183 |
Greater than 90 days | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 75 | 74 |
Domestic credit card: | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 89,059 | 96,116 |
Past due | 2,040 | 2,388 |
Total Loans | 91,099 | 98,504 |
Domestic credit card: | 30-59 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 527 | 755 |
Total Loans | 527 | 755 |
Domestic credit card: | 60-89 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 393 | 464 |
Total Loans | 393 | 464 |
Domestic credit card: | Greater than 90 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 1,120 | 1,169 |
Total Loans | 1,120 | 1,169 |
International card businesses: | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 7,819 | 8,218 |
Past due | 209 | 234 |
Total Loans | 8,028 | 8,452 |
International card businesses: | 30-59 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 71 | 90 |
Total Loans | 71 | 90 |
International card businesses: | 60-89 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 47 | 58 |
Total Loans | 47 | 58 |
International card businesses: | Greater than 90 days | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 91 | 86 |
Total Loans | $ 91 | $ 86 |

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