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Loans - Credit Card: Risk Profile by Geographic Region and Delinquency Status (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 229,851 $ 208,316 $ 197,199
Past due $ 6,895 $ 6,070  
30 Plus day delinquencies (as percent) 3.00% 2.91%  
Credit Card Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 96,125 $ 85,876  
Percentage of portfolio 100.00% 100.00%  
Past due $ 3,268 $ 2,832  
Credit Card Portfolio Segment [Member] | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 10,029 $ 8,574  
Percentage of portfolio 10.50% 10.00%  
Credit Card Portfolio Segment [Member] | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 6,446 $ 5,610  
Percentage of portfolio 6.70% 6.50%  
Credit Card Portfolio Segment [Member] | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 6,344 $ 5,382  
Percentage of portfolio 6.60% 6.30%  
Credit Card Portfolio Segment [Member] | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 5,712 $ 4,794  
Percentage of portfolio 5.90% 5.60%  
Credit Card Portfolio Segment [Member] | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 4,121 $ 3,747  
Percentage of portfolio 4.30% 4.40%  
Credit Card Portfolio Segment [Member] | Pennsylvania      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 3,764 $ 3,581  
Percentage of portfolio 3.90% 4.20%  
Credit Card Portfolio Segment [Member] | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 3,371 $ 3,075  
Percentage of portfolio 3.50% 3.60%  
Credit Card Portfolio Segment [Member] | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 3,210 $ 2,868  
Percentage of portfolio 3.30% 3.30%  
Credit Card Portfolio Segment [Member] | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 2,922 $ 2,681  
Percentage of portfolio 3.00% 3.10%  
Credit Card Portfolio Segment [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 42,020 $ 37,392  
Percentage of portfolio 43.80% 43.50%  
Credit Card Portfolio Segment [Member] | Canada      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 4,889 $ 4,747  
Percentage of portfolio 5.10% 5.50%  
Credit Card Portfolio Segment [Member] | United Kingdom      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 3,297 $ 3,425  
Percentage of portfolio 3.40% 4.00%  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due $ 2,158 $ 1,805  
30 Plus day delinquencies (as percent) 0.94% 0.87%  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due $ 1,527 $ 1,292  
Geographic Distribution, Domestic [Member] | Credit Card Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 87,939 $ 77,704  
Percentage of portfolio 91.50% 90.50%  
Past due $ 2,985 $ 2,538  
Geographic Distribution, Domestic [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,421 1,181  
Geographic Distribution, Foreign [Member] | Credit Card Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 8,186 $ 8,172  
Percentage of portfolio 8.50% 9.50%  
Past due $ 283 $ 294  
Geographic Distribution, Foreign [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Card Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due $ 106 $ 111