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Loans - Loan Portfolio Composition and Aging Analysis (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current $ 187,292 $ 178,746  
Past due 6,294 6,070  
Loans held for investment $ 213,329 $ 208,316 $ 201,592
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Financing Receivable, Percent Current 87.79% 85.81%  
Total Delinquent Loans (as percent) 2.95% 2.91%  
Total Loans (as percent) 100.00% 100.00%  
Loans and Leases Receivable, Deferred Income $ 901 $ 1,100  
Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 87,168 83,021  
Past due 2,967 2,832  
Loans held for investment 90,135 85,876  
Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 48,383 45,130  
Past due 2,995 3,024  
Loans held for investment $ 70,990 $ 71,439  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 4.22% 4.23%  
Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current $ 38,348 $ 35,142  
Past due 2,704 2,682  
Loans held for investment $ 41,052 $ 37,824  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 6.59% 7.09%  
Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current $ 6,516 $ 6,492  
Past due 248 302  
Loans held for investment $ 26,340 $ 30,035  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.94% 1.01%  
Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current $ 3,519 $ 3,496  
Past due 43 40  
Loans held for investment $ 3,598 $ 3,580  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 1.20% 1.11%  
Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current $ 51,660 $ 50,498  
Past due 321 200  
Loans held for investment 52,112 50,890  
Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 51,012 49,727  
Past due 315 190  
Loans held for investment 51,458 50,109  
Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 23,487 22,974  
Past due 64 117  
Loans held for investment 23,585 23,137  
Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 27,525 26,753  
Past due 251 73  
Loans held for investment 27,873 26,972  
Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 648 771  
Past due 6 10  
Loans held for investment 654 781  
Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 81 97  
Past due 11 14  
Loans held for investment 92 111  
Receivables Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment $ 19,743 $ 23,500  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Loans (as percent) 9.26% 11.28%  
Receivables Acquired with Deteriorated Credit Quality [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment $ 0 $ 23  
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 19,612 23,285  
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 0  
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 19,576 23,241  
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 36 44  
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 131 192  
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 131 192  
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 34 46  
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 97 146  
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 0  
Receivables Acquired with Deteriorated Credit Quality [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 $ 2,899 $ 2,841  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 1.36% 1.36%  
Financing Receivables, 30 to 59 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 1,001 $ 904  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1,780 1,825  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1,712 1,751  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 48 57  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 20 17  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 115 109  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 113 103  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 31 74  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 82 29  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 2 6  
Financing Receivables, 30 to 59 Days Past Due [Member] | Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 3 3  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 1,546 $ 1,424  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.72% 0.68%  
Financing Receivables, 60 to 89 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 672 $ 636  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 818 768  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 791 734  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home loan      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 22 27  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Retail banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 5 7  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 55 18  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 53 17  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 29 7  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 24 10  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Banking | Small-ticket commercial real estate      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 2 1  
Financing Receivables, 60 to 89 Days Past Due [Member] | Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 1 2  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 1,849 $ 1,805  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.87% 0.87%  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 1,294 $ 1,292  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 397 $ 431  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.56% 0.60%  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Auto      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 201 $ 197  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.49% 0.52%  
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 $ 178 $ 218  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.67% 0.73%  
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 $ 18 $ 16  
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]      
Total Delinquent Loans (as percent) 0.51% 0.44%  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Banking      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due $ 151 $ 73  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Banking | Total commercial lending      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 149 70  
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 4 36  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Banking | Commercial and industrial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 145 34  
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 2 3  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Past due 7 9  
Geographic Distribution, Domestic [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 79,481 75,143  
Past due 2,697 2,538  
Loans held for investment 82,178 77,704  
Geographic Distribution, Domestic [Member] | Credit Card Portfolio Segment [Member] | Installment loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Gross 97 144  
Geographic Distribution, Domestic [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Loans held for investment 0 23  
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 894 790  
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 607 567  
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 1,196 1,181  
Geographic Distribution, Foreign [Member] | Credit Card Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current 7,687 7,878  
Past due 270 294  
Loans held for investment 7,957 8,172  
Geographic Distribution, Foreign [Member] | Receivables Acquired with Deteriorated Credit Quality [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 107 114  
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 65 69  
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 $ 98 $ 111