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Loans - Loan Portfolio Composition and Aging Analysis (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 803 $ 773  
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 230,087 234,834  
Past due 8,311 8,864  
Loans held for investment $ 238,761 $ 254,473 $ 252,422
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Financing Receivable, Percent Current 96.37% 92.29%  
Total Delinquent Loans (as percent) 3.48% 3.48%  
Total Loans (as percent) 100.00% 100.00%  
Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current $ 106,483 $ 110,182  
Past due 4,202 4,578  
Loans held for investment 110,685 114,762  
Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 55,399 60,775  
Past due 3,925 4,010  
Loans held for investment 59,329 75,078  
Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 52,542 50,151  
Past due 3,880 3,840  
Loans held for investment 56,422 53,991  
Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current   7,235  
Past due   123  
Loans held for investment   17,633  
Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 2,857 3,389  
Past due 45 47  
Loans held for investment 2,907 3,454  
Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 68,205 63,823  
Past due 184 272  
Loans held for investment 68,747 64,575  
Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 67,853 63,430  
Past due 178 265  
Loans held for investment 68,389 64,175  
Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 29,018 26,018  
Past due 23 107  
Loans held for investment 29,064 26,150  
Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 38,835 37,412  
Past due 155 158  
Loans held for investment 39,325 38,025  
Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 352 393  
Past due 6 7  
Loans held for investment 358 400  
Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 0 54  
Past due 0 4  
Loans held for investment 0 58  
Financial Asset Acquired with Credit Deterioration [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment $ 363 $ 10,775  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Loans (as percent) 0.15% 4.23%  
Financial Asset Acquired with Credit Deterioration [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment $ 0 $ 2  
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 5 10,293  
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment   10,275  
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 5 18  
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 358 480  
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 358 480  
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 23 25  
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 335 455  
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 0  
Financing Receivables, 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 3,772 $ 3,945  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 1.58% 1.55%  
Financing Receivables, 30 to 59 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 1,338 $ 1,355  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 2,403 2,544  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 2,384 2,483  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due   37  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 19 24  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 31 44  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 28 42  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 2 41  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 26 1  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 3 2  
Financing Receivables, 30 to 59 Days Past Due [Member] | Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 0 2  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 2,197 $ 2,166  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.92% 0.85%  
Financing Receivables, 60 to 89 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 955 $ 996  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1,197 1,081  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1,186 1,060  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due   16  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 11 5  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 45 88  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 45 87  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 20 17  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 25 70  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 0 1  
Financing Receivables, 60 to 89 Days Past Due [Member] | Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 0 1  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 2,342 $ 2,753  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.98% 1.08%  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 1,909 $ 2,227  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 325 385  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 310 297  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due   70  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 15 18  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 108 140  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 105 136  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1 49  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 104 87  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 3 4  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 0 1  
Geographic Distribution, Domestic [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 97,700 101,072  
Past due 3,864 4,219  
Loans held for investment 101,564 105,293  
Geographic Distribution, Domestic [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 2  
Geographic Distribution, Domestic [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1,202 1,211  
Geographic Distribution, Domestic [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 877 915  
Geographic Distribution, Domestic [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1,785 2,093  
Geographic Distribution, Foreign [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 8,783 9,110  
Past due 338 359  
Loans held for investment 9,121 9,469  
Geographic Distribution, Foreign [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 0  
Geographic Distribution, Foreign [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 136 144  
Geographic Distribution, Foreign [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 78 81  
Geographic Distribution, Foreign [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 124 $ 134