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Loans and Allowance for Loan Losses (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Total troubled debt restructured loans $ 512 $ 512 $ 473
90 days or more past due and still accruing 0 0 1
Commitment to lend additional funds to borrowers with Loan modifications classified as TDRs 56 56  
Minimum defaulting period   60 days  
Loans and allowance for loan losses (Textual) [Abstract]      
Carrying value of other acquired loans 1,663 1,663 902
Loans and leases receivable net of deferred income 54,291 54,291 53,540
Loans and leases receivable net of deferred income 698 698 949
Total loans held for investment 54,291 54,291 53,540
Performing home equity loans was reclassified to nonaccrual 553 553 638
Pass [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Revised pass and criticized loans     266
Criticized [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Revised pass and criticized loans     87
Other [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Carrying value of other acquired loans 40 40 47
Commercial [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Interest income recognized for impaired loans 2 4  
Performing home equity loans was reclassified to nonaccrual 176 176 282
Commercial [Member] | FDIC Covered [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Total loans held for investment 627 627 864
Consumer [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Interest income recognized for impaired loans 2 3  
Performing home equity loans was reclassified to nonaccrual 337 337 309
Consumer [Member] | FDIC Covered [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Total loans held for investment 71 71 85
Covered Loans [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Performing home equity loans was reclassified to nonaccrual 40 40 47
Nonaccrual Loans Excluding FDIC Covered Loans [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Interest income recognized for impaired loans   1  
Performing home equity loans was reclassified to nonaccrual 513 513 591
Nonaccrual Loans Excluding FDIC Covered Loans [Member] | Maximum [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Interest income recognized for impaired loans 1    
Loans Receivable [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Transfer of loans from held for investment to held for sale   143  
Loans receivable sold during the period   194  
Home Equity and Other Consumer Loans [Member]
     
Loans and allowance for loan losses (Textual) [Abstract]      
Performing home equity loans was reclassified to nonaccrual $ 44 $ 44 $ 24