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Loans and Allowance for Loan Losses - Allowance for Loan Losses and Related Loan Balances by Portfolio Segment (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Allowance for loan losses:          
Individually evaluated for impairment $ 69   $ 69    
Collectively evaluated for impairment 587   679    
Purchased credit-impaired loans 12   16    
Loans held for investment:          
Individually evaluated for impairment 620   572    
Collectively evaluated for impairment 54,296   52,066    
Purchased credit-impaired loans 494   902    
Total loans held for investment 54,886   52,591    
Total loans held for investment 55,410 [1]   53,540 [1]    
FDIC Covered [Member]
         
Allowance for loan losses:          
Individually evaluated for impairment     1    
Purchased credit-impaired loans 12   16    
Loans held for investment:          
Individually evaluated for impairment 8   12    
Collectively evaluated for impairment 22   35    
Purchased credit-impaired loans 494   902    
Total loans held for investment 524   949    
Commercial portfolio [Member]
         
Allowance for loan losses:          
Individually evaluated for impairment 20   54    
Collectively evaluated for impairment 352   420    
Loans held for investment:          
Individually evaluated for impairment 350   416    
Collectively evaluated for impairment 29,707   28,820    
Total allowance for loan losses 372 388 474 475 683
Total loans held for investment 30,057   29,236    
Consumer portfolio [Member]
         
Allowance for loan losses:          
Individually evaluated for impairment 49   14    
Collectively evaluated for impairment 67   124    
Loans held for investment:          
Individually evaluated for impairment 262   144    
Collectively evaluated for impairment 24,567   23,211    
Total allowance for loan losses 116 126 138 151 185
Total loans held for investment 24,829   23,355    
Unallocated [Member]
         
Allowance for loan losses:          
Collectively evaluated for impairment 168   135    
Loans held for investment:          
Total allowance for loan losses $ 168 $ 138 $ 135 $ 183 $ 298
[1] Includes $6 million and ($30) million at September 30, 2012 and December 31, 2011, respectively, for net unamortized discounts and premiums and deferred fees and costs.