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Loans - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended
Sep. 06, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Feb. 19, 2013
Dec. 31, 2012
Loans [Line Items]              
Total loans held for investment   $ 191,814,000,000 $ 203,132,000,000 $ 191,814,000,000 $ 203,132,000,000   $ 205,889,000,000
Increase (decrease) in allowance related to pools of accounts   10,000,000   25,000,000      
Cumulative impairment recognized on acquired loans   32,000,000   32,000,000     57,000,000
Assets subject to sale agreement, loan   187,481,000,000   187,481,000,000   7,000,000,000 200,733,000,000
Adjustment to portfolio asset lower of cost or market 19,000,000            
Total loans held for sale   180,000,000   180,000,000     201,000,000
Number of days account is past due when loans are reported delinquent (in days)       90 Days      
Percentage, 30+ day delinquencies   3.60%   3.60%     3.69%
Minimum loan amount requiring annual review       1,000,000      
Minimum loan amount reviewed quarterly by management for further deterioration       1,000,000      
Troubled debt restructurings included in impaired loans   1,700,000,000   1,700,000,000     1,800,000,000
Impairment benefit and increased allowance through provision for credit losses   10,000,000   25,000,000      
Impairment increase and impairment benefit     31,000,000   42,000,000    
Unused credit card lines available to customers   276,600,000,000   276,600,000,000     298,900,000,000
Outstanding unfunded commitments to extend credit other than credit card lines   20,600,000,000   20,600,000,000     17,500,000,000
Consumer Banking [Member]
              
Loans [Line Items]              
TDRs classified as performing loans   996,000,000   996,000,000     1,200,000,000
Commercial Banking [Member]
              
Loans [Line Items]              
TDRs classified as performing loans   193,000,000   193,000,000     253,000,000
Acquired Loans [Member]
              
Loans [Line Items]              
Total loans held for investment   30,080,000,000   30,080,000,000     37,134,000,000
Percentage, 30+ day delinquencies   0.03%   0.03%     0.07%
Greater Than or Equal to 90 Days [Member]
              
Loans [Line Items]              
Total loans held for investment   1,739,000,000   1,739,000,000     2,256,000,000
Nonperforming Loans [Member]
              
Loans [Line Items]              
Total loans held for investment   $ 882,000,000   $ 882,000,000     $ 1,054,000,000