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Loans and Allowance for Credit Losses (Details 1) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Carrying amount of the covered assets    
Purchased impaired loans $ 6,076 $ 6,143
Purchased nonimpaired loans 7,535 8,762
Other assets 3,138 3,590
Total 16,479 18,495
Commercial Loan [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 70 70
Purchased nonimpaired loans 195 260
Other assets 0 0
Total 265 330
Commercial Real Estate Loans [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 2,185 2,254
Purchased nonimpaired loans 4,966 5,952
Other assets 0 0
Total 7,151 8,206
Residential Mortgage [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 3,821 3,819
Purchased nonimpaired loans 1,475 1,620
Other assets 0 0
Total 5,296 5,439
Retail Loans [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 0 0
Purchased nonimpaired loans 899 930
Other assets 0 0
Total 899 930
Losses Reimbursable By FDIC [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 0 0
Purchased nonimpaired loans 0 0
Other assets 2,790 3,137
Total 2,790 3,137
Covered Loans [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 6,076 6,143
Purchased nonimpaired loans 7,535 8,762
Other assets 2,790 3,137
Total 16,401 18,042
Foreclosed Real Estate [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 0 0
Purchased nonimpaired loans 0 0
Other assets 348 453
Total $ 348 $ 453