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Loans - Credit Card: Risk Profile by Geographic Region and Delinquency Status (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 238,761 $ 254,473 $ 252,422
Credit Card Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 110,685 $ 114,762  
Percentage of portfolio 100.00% 100.00%  
Credit Card Portfolio Segment [Member] | California      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 11,012 $ 11,475  
Percentage of portfolio 9.90% 10.00%  
Credit Card Portfolio Segment [Member] | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 7,699 $ 7,847  
Percentage of portfolio 7.00% 6.80%  
Credit Card Portfolio Segment [Member] | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 7,049 $ 7,389  
Percentage of portfolio 6.40% 6.40%  
Credit Card Portfolio Segment [Member] | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 6,648 $ 6,790  
Percentage of portfolio 6.00% 5.90%  
Credit Card Portfolio Segment [Member] | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,520 $ 4,734  
Percentage of portfolio 4.10% 4.10%  
Credit Card Portfolio Segment [Member] | Pennsylvania      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,313 $ 4,550  
Percentage of portfolio 3.90% 4.00%  
Credit Card Portfolio Segment [Member] | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,723 $ 3,929  
Percentage of portfolio 3.40% 3.40%  
Credit Card Portfolio Segment [Member] | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,457 $ 3,621  
Percentage of portfolio 3.10% 3.20%  
Credit Card Portfolio Segment [Member] | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,381 $ 3,523  
Percentage of portfolio 3.10% 3.10%  
Credit Card Portfolio Segment [Member] | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 49,762 $ 51,435  
Percentage of portfolio 44.90% 44.80%  
Credit Card Portfolio Segment [Member] | Canada      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 6,119 $ 6,286  
Percentage of portfolio 5.50% 5.50%  
Credit Card Portfolio Segment [Member] | United Kingdom      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,002 $ 3,183  
Percentage of portfolio 2.70% 2.80%  
Credit Card Portfolio Segment [Member] | Geographic Distribution, Domestic [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 101,564 $ 105,293  
Percentage of portfolio 91.80% 91.70%  
Credit Card Portfolio Segment [Member] | Geographic Distribution, Foreign [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 9,121 $ 9,469  
Percentage of portfolio 8.20% 8.30%