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Allowance for Loan and Lease Losses - Components of Allowance for Loan and Lease Losses by Impairment Methodology (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 6,477 $ 6,007    
Asset-specific 475 465    
Total allowance for loan and lease losses 6,984 6,503    
Loans held for investment by impairment methodology:        
Collectively evaluated 223,690 227,555    
Asset-specific 2,796 2,960    
Loans held for investment $ 240,588 $ 245,586 $ 227,613  
Allowance as a percentage of period-end loans held for investment 2.90% 2.65%    
Credit Card Portfolio Segment [Member]        
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 4,796 $ 4,367    
Asset-specific 262 239    
Total allowance for loan and lease losses 5,058 4,606 3,785 $ 3,654
Loans held for investment by impairment methodology:        
Collectively evaluated 98,478 104,835    
Asset-specific 735 715    
Loans held for investment $ 99,213 $ 105,552    
Allowance as a percentage of period-end loans held for investment 5.10% 4.36%    
Consumer Portfolio Segment [Member]        
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 1,076 $ 1,016    
Asset-specific 57 57    
Total allowance for loan and lease losses 1,163 1,102 914 868
Loans held for investment by impairment methodology:        
Collectively evaluated 59,760 57,862    
Asset-specific 714 736    
Loans held for investment $ 73,982 $ 73,054    
Allowance as a percentage of period-end loans held for investment 1.57% 1.51%    
Commercial Banking        
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 603 $ 622    
Asset-specific 156 169    
Total allowance for loan and lease losses 761 793 714 604
Loans held for investment by impairment methodology:        
Collectively evaluated 65,379 64,794    
Asset-specific 1,347 1,509    
Loans held for investment $ 67,320 $ 66,916    
Allowance as a percentage of period-end loans held for investment 1.13% 1.19%    
Other        
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 2 $ 2    
Asset-specific 0 0    
Total allowance for loan and lease losses 2 2 $ 3 $ 4
Loans held for investment by impairment methodology:        
Collectively evaluated 73 64    
Asset-specific 0 0    
Loans held for investment $ 73 $ 64    
Allowance as a percentage of period-end loans held for investment 2.74% 3.13%    
Receivables Acquired with Deteriorated Credit Quality [Member]        
Allowance for loan and lease losses by impairment methodology:        
Financing Receivable, Allowance for Credit Losses $ 32 $ 31    
Loans held for investment by impairment methodology:        
Loans held for investment 14,102 15,071    
Receivables Acquired with Deteriorated Credit Quality [Member] | Credit Card Portfolio Segment [Member]        
Allowance for loan and lease losses by impairment methodology:        
Financing Receivable, Allowance for Credit Losses 0 0    
Loans held for investment by impairment methodology:        
Loans held for investment 0 2    
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member]        
Allowance for loan and lease losses by impairment methodology:        
Financing Receivable, Allowance for Credit Losses 30 29    
Loans held for investment by impairment methodology:        
Loans held for investment 13,508 14,456    
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Banking        
Allowance for loan and lease losses by impairment methodology:        
Financing Receivable, Allowance for Credit Losses 2 2    
Loans held for investment by impairment methodology:        
Loans held for investment 594 613    
Receivables Acquired with Deteriorated Credit Quality [Member] | Other        
Allowance for loan and lease losses by impairment methodology:        
Financing Receivable, Allowance for Credit Losses 0 0    
Loans held for investment by impairment methodology:        
Loans held for investment $ 0 $ 0