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Loans - Loan Portfolio Composition and Aging Analysis (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | $ 255,736 | $ 236,310 |
Past due | 9,947 | 9,454 |
Loans held for investment | $ 265,809 | $ 245,899 | $ 254,473
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Current, percentage of total loans | 96.20% | 96.10% |
Past due, percentage of total loans | 3.70% | 3.80% |
Percentage of total loans | 100.00% | 100.00% |
Unamortized premiums and discounts, deferred fees and costs | $ 1,100 | $ 818 |
Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 123,134 | 111,692 |
Past due | 5,009 | 4,668 |
Loans held for investment | 128,236 | 116,361 |
Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 58,436 | 54,841 |
Past due | 4,627 | 4,360 |
Loans held for investment | 63,065 | 59,205 |
Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 55,778 | 52,032 |
Past due | 4,584 | 4,309 |
Loans held for investment | 60,362 | 56,341 |
Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 2,658 | 2,809 |
Past due | 43 | 51 |
Loans held for investment | 2,703 | 2,864 |
Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 74,166 | 69,777 |
Past due | 311 | 426 |
Loans held for investment | 74,508 | 70,333 |
Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current |  | 69,441 |
Past due |  | 419 |
Loans held for investment |  | 69,990 |
Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 30,157 | 28,737 |
Past due | 67 | 140 |
Loans held for investment | 30,245 | 28,899 |
Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 44,009 | 40,704 |
Past due | 244 | 279 |
Loans held for investment | 44,263 | 41,091 |
Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current |  | 336 |
Past due |  | 7 |
Loans held for investment |  | 343 |
PCI Loans |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | $ 126 | $ 135 |
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Percentage of total loans | 0.10% | 0.10% |
PCI Loans | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | $ 93 | $ 1 |
PCI Loans | Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | 2 | 4 |
PCI Loans | Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | 0 | 0 |
PCI Loans | Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | 2 | 4 |
PCI Loans | Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | 31 | 130 |
PCI Loans | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment |  | 130 |
PCI Loans | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | 21 | 22 |
PCI Loans | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | 10 | 108 |
PCI Loans | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment |  | 0 |
Financing Receivables, 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 4,444 | $ 4,282 |
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Past due, percentage of total loans | 1.60% | 1.70% |
Financing Receivables, 30 to 59 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 1,474 | $ 1,397 |
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 2,852 | 2,647 |
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 2,828 | 2,624 |
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 24 | 23 |
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 118 | 238 |
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due |  | 236 |
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 43 | 101 |
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 75 | 135 |
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due |  | 2 |
Financing Receivables, 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 2,537 | $ 2,430 |
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Past due, percentage of total loans | 1.00% | 1.00% |
Financing Receivables, 60 to 89 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 1,122 | $ 1,032 |
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 1,369 | 1,334 |
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 1,361 | 1,326 |
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 8 | 8 |
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 46 | 64 |
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due |  | 63 |
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 20 | 20 |
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 26 | 43 |
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due |  | 1 |
Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 2,966 | $ 2,742 |
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] |  |  |
Past due, percentage of total loans | 1.10% | 1.10% |
Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 2,413 | $ 2,239 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 406 | 379 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking | Auto |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 395 | 359 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking | Retail banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 11 | 20 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 147 | 124 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Total commercial lending |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due |  | 120 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 4 | 19 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 143 | 101 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Small-ticket commercial real estate |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due |  | 4 |
Domestic credit card | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 113,857 | 103,014 |
Past due | 4,656 | 4,335 |
Loans held for investment | 118,606 | 107,350 |
Domestic credit card | PCI Loans | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | 93 | 1 |
Domestic credit card | Financing Receivables, 30 to 59 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 1,341 | 1,270 |
Domestic credit card | Financing Receivables, 60 to 89 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 1,038 | 954 |
Domestic credit card | Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 2,277 | 2,111 |
International card business | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Current | 9,277 | 8,678 |
Past due | 353 | 333 |
Loans held for investment | 9,630 | 9,011 |
International card business | PCI Loans | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Loans held for investment | 0 | 0 |
International card business | Financing Receivables, 30 to 59 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 133 | 127 |
International card business | Financing Receivables, 60 to 89 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | 84 | 78 |
International card business | Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card |  |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |  |
Past due | $ 136 | $ 128 |

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