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Loans and Allowance for Credit Losses (Details 8) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Carrying amount of the covered assets    
Purchased impaired loans $ 5,854 $ 6,143
Purchased non-impaired loans 6,407 8,762
Other assets 2,800 3,590
Total 15,061 18,495
Commercial loans [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 68 70
Purchased non-impaired loans 137 260
Other assets 0 0
Total 205 330
Commercial real estate loans [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 1,956 2,254
Purchased non-impaired loans 4,037 5,952
Other assets 0 0
Total 5,993 8,206
Residential mortgage loans [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 3,830 3,819
Purchased non-impaired loans 1,360 1,620
Other assets 0 0
Total 5,190 5,439
Credit card portfolio segment [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 0 0
Purchased non-impaired loans 6 5
Other assets 0 0
Total 6 5
Other retail portfolio segment [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 0 0
Purchased non-impaired loans 867 925
Other assets 0 0
Total 867 925
Losses reimbursable by FDIC [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 0 0
Purchased non-impaired loans 0 0
Other assets 2,526 3,137
Total 2,526 3,137
Covered portfolio segment [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 5,854 6,143
Purchased non-impaired loans 6,407 8,762
Other assets 2,526 3,137
Total 14,787 18,042
Foreclosed real estate [Member]
   
Carrying amount of the covered assets    
Purchased impaired loans 0 0
Purchased non-impaired loans 0 0
Other assets 274 453
Total $ 274 $ 453