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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
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Allowance for loan and lease losses by impairment methodology:            
Collectively evaluated $ 4,520   $ 4,056      
Asset-specific 299   300      
Total allowance for loan and lease losses $ 4,847   $ 4,383      
Loans held for investment by impairment methodology:            
Allowance as a percentage of period-end loans held for investment 2.27%   2.10%      
Collectively evaluated $ 191,599   $ 183,107      
Asset-specific 1,987   1,709      
Loans held for investment 213,329   208,316 $ 201,592    
Credit Card Portfolio Segment [Member]            
Allowance for loan and lease losses by impairment methodology:            
Collectively evaluated 3,276   2,985      
Asset-specific 208   219      
Total allowance for loan and lease losses $ 3,484 $ 3,324 $ 3,204 3,057 $ 2,858 $ 3,214
Loans held for investment by impairment methodology:            
Allowance as a percentage of period-end loans held for investment 3.86%   3.73%      
Collectively evaluated $ 89,469   $ 85,161      
Asset-specific 666   692      
Loans held for investment 90,135   85,876      
Consumer Portfolio Segment [Member]            
Allowance for loan and lease losses by impairment methodology:            
Collectively evaluated 783   710      
Asset-specific 50   42      
Total allowance for loan and lease losses $ 860 875 $ 779 772 765 752
Loans held for investment by impairment methodology:            
Allowance as a percentage of period-end loans held for investment 1.21%   1.09%      
Collectively evaluated $ 50,698   $ 47,507      
Asset-specific 680   647      
Loans held for investment 70,990   71,439      
Consumer Portfolio Segment [Member] | Auto            
Allowance for loan and lease losses by impairment methodology:            
Collectively evaluated 712   642      
Asset-specific 22   19      
Total allowance for loan and lease losses $ 734 744 $ 661 660 642 606
Loans held for investment by impairment methodology:            
Allowance as a percentage of period-end loans held for investment 1.79%   1.75%      
Collectively evaluated $ 40,788   $ 37,594      
Asset-specific 264   230      
Loans held for investment 41,052   37,824      
Consumer Portfolio Segment [Member] | Home loan            
Allowance for loan and lease losses by impairment methodology:            
Collectively evaluated 17   18      
Asset-specific 16   17      
Total allowance for loan and lease losses $ 60 65 $ 62 55 67 83
Loans held for investment by impairment methodology:            
Allowance as a percentage of period-end loans held for investment 0.23%   0.21%      
Collectively evaluated $ 6,407   $ 6,427      
Asset-specific 357   367      
Loans held for investment 26,340   30,035      
Consumer Portfolio Segment [Member] | Retail banking            
Allowance for loan and lease losses by impairment methodology:            
Collectively evaluated 54   50      
Asset-specific 12   6      
Total allowance for loan and lease losses $ 66 66 $ 56 57 56 63
Loans held for investment by impairment methodology:            
Allowance as a percentage of period-end loans held for investment 1.86%   1.58%      
Collectively evaluated $ 3,503   $ 3,486      
Asset-specific 59   50      
Loans held for investment 3,598   3,580      
Commercial Banking            
Allowance for loan and lease losses by impairment methodology:            
Collectively evaluated 457   356      
Asset-specific 41   39      
Total allowance for loan and lease losses $ 499 472 $ 395 378 368 338
Loans held for investment by impairment methodology:            
Allowance as a percentage of period-end loans held for investment 0.96%   0.78%      
Collectively evaluated $ 51,340   $ 50,328      
Asset-specific 641   370      
Loans held for investment 52,112   50,890      
Other            
Allowance for loan and lease losses by impairment methodology:            
Collectively evaluated 4   5      
Asset-specific 0   0      
Total allowance for loan and lease losses $ 4 $ 5 $ 5 $ 5 $ 7 $ 11
Loans held for investment by impairment methodology:            
Allowance as a percentage of period-end loans held for investment 4.71%   4.68%      
Collectively evaluated $ 92   $ 111      
Asset-specific 0   0      
Loans held for investment 92   111      
Receivables Acquired with Deteriorated Credit Quality [Member]            
Allowance for loan and lease losses by impairment methodology:            
Financing Receivable, Allowance for Credit Losses 28   27      
Loans held for investment by impairment methodology:            
Loans held for investment 19,743   23,500      
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   23      
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 27   27      
Loans held for investment by impairment methodology:            
Loans held for investment 19,612   23,285      
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member] | Auto            
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      
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member] | Home loan            
Allowance for loan and lease losses by impairment methodology:            
Financing Receivable, Allowance for Credit Losses 27   27      
Loans held for investment by impairment methodology:            
Loans held for investment 19,576   23,241      
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member] | Retail banking            
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 36   44      
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Banking            
Allowance for loan and lease losses by impairment methodology:            
Financing Receivable, Allowance for Credit Losses 1   0      
Loans held for investment by impairment methodology:            
Loans held for investment 131   192      
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