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Loans - Loan Portfolio Composition and Aging Analysis (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current $ 231,966 $ 236,310  
Past due 8,181 9,454  
Loans held for investment $ 240,273 $ 245,899 $ 248,256
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Current, percentage of total loans 96.50% 96.10%  
Past due, percentage of total loans 3.40% 3.80%  
Percentage of total loans 100.00% 100.00%  
Unamortized premiums and discounts, deferred fees and costs $ 870 $ 818  
Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 105,746 111,692  
Past due 4,090 4,668  
Loans held for investment 109,836 116,361  
Consumer Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 55,676 54,841  
Past due 3,569 4,360  
Loans held for investment 59,248 59,205  
Consumer Banking | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 52,921 52,032  
Past due 3,523 4,309  
Loans held for investment 56,444 56,341  
Consumer Banking | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 2,755 2,809  
Past due 46 51  
Loans held for investment 2,804 2,864  
Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 70,544 69,777  
Past due 522 426  
Loans held for investment 71,189 70,333  
Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 70,543 69,441  
Past due 515 419  
Loans held for investment 71,181 69,990  
Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 28,881 28,737  
Past due 81 140  
Loans held for investment 28,984 28,899  
Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 41,662 40,704  
Past due 434 279  
Loans held for investment 42,197 41,091  
Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 1 336  
Past due 7 7  
Loans held for investment 8 343  
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 $ 0 $ 1  
PCI Loans | Consumer Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 3 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 3 4  
PCI Loans | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 123 130  
PCI Loans | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 123 130  
PCI Loans | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 22 22  
PCI Loans | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 101 108  
PCI Loans | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 0  
Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 3,750 $ 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 $ 1,153 $ 1,397  
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 2,342 2,647  
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 2,321 2,624  
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 21 23  
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 255 238  
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 254 236  
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 37 101  
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 217 135  
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1 2  
Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 1,952 $ 2,430  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Past due, percentage of total loans 0.80% 1.00%  
Financing Receivables, 60 to 89 Days Past Due | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 858 $ 1,032  
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 977 1,334  
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 971 1,326  
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 6 8  
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 117 64  
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 117 63  
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 33 20  
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 84 43  
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 0 1  
Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 2,479 $ 2,742  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Past due, percentage of total loans 1.00% 1.10%  
Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 2,079 $ 2,239  
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 250 379  
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 231 359  
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 19 20  
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 150 124  
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 144 120  
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 11 19  
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 133 101  
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 6 4  
Domestic credit card | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 97,295 103,014  
Past due 3,757 4,335  
Loans held for investment 101,052 107,350  
Domestic credit card | PCI Loans | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 1  
Domestic credit card | Financing Receivables, 30 to 59 Days Past Due | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1,029 1,270  
Domestic credit card | Financing Receivables, 60 to 89 Days Past Due | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 780 954  
Domestic credit card | Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1,948 2,111  
International card business | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 8,451 8,678  
Past due 333 333  
Loans held for investment 8,784 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 124 127  
International card business | Financing Receivables, 60 to 89 Days Past Due | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 78 78  
International card business | Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 131 $ 128