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Loans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]      
Pledged Financial Instruments, Not separately reported, Loans Receivable, for Federal Home Loan Bank Debt, UPB $ 29,300 $ 36,900  
Loans held for investment 245,586 229,851 $ 208,316
Loans held for sale 1,043 904  
Mortgage loans in process of foreclosure 382 474  
Uncollectible Portion of Billed Finance Charges and Fees 1,100 732 645
Finance Charge And Fees Reserves 402 262  
Payments for Origination of Mortgage Loans Held-for-sale $ 7,600 $ 6,400 $ 5,400
Loans Sold, Percent Retained Servicing 100.00% 100.00% 96.00%
Loans and Leases Receivable, Impaired, Commitment to Lend $ 208 $ 34  
Performing      
Loans and Leases Receivable Disclosure [Line Items]      
Troubled debt restructurings included in impaired loans 2,500 1,800  
Home loan | Other Assets      
Loans and Leases Receivable Disclosure [Line Items]      
Real estate acquired through foreclosure 69 123  
Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 64 88  
Consumer Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 73,054 70,372  
Consumer Portfolio Segment [Member] | Performing      
Loans and Leases Receivable Disclosure [Line Items]      
Troubled debt restructurings included in impaired loans 1,100 1,000  
Consumer Portfolio Segment [Member] | Home loan      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 21,584 25,227  
Commercial Banking      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 66,916 63,266  
Commercial Banking | Criticized      
Loans and Leases Receivable Disclosure [Line Items]      
Minimum loan amount reviewed quarterly by management for further deterioration 1    
Commercial Banking | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Minimum loan amount requiring annual review 1    
Commercial Banking | Performing      
Loans and Leases Receivable Disclosure [Line Items]      
Troubled debt restructurings included in impaired loans 487 334  
Credit Card Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 105,552 96,125  
Unused Commitments to Extend Credit 312,864 308,257  
Other Portfolio Segments, Excluding Credit Card      
Loans and Leases Receivable Disclosure [Line Items]      
Unused Commitments to Extend Credit 28,402 27,883  
Advised Line of Credit $ 699 $ 1,000  
Home Loans      
Loans and Leases Receivable Disclosure [Line Items]      
Threshold Period Past Due for Entering Foreclosure Process Status of Financing Receivables 120 days