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Loans (Details 15) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Delinquency ratio for consumer loan    
Dollars of Delinquency $ 52 $ 53
Consumer Loan [Member]
   
Delinquency ratio for consumer loan    
Dollars of Delinquency 1,220 1,258
Delinquency Ratio 6.18% 6.01%
Consumer Loan [Member] | Residential mortgages, excluding home equity mortgages [Member]
   
Delinquency ratio for consumer loan    
Dollars of Delinquency 1,107 1,101
Delinquency Ratio 7.16% 7.19%
Consumer Loan [Member] | Home equity mortgages [Member]
   
Delinquency ratio for consumer loan    
Dollars of Delinquency 62 99
Delinquency Ratio 2.33% 2.89%
Consumer Loan [Member] | Total residential mortgages [Member]
   
Delinquency ratio for consumer loan    
Dollars of Delinquency 1,169 1,200
Delinquency Ratio 6.45% 6.41%
Consumer Loan [Member] | Credit card receivables [Member]
   
Delinquency ratio for consumer loan    
Dollars of Delinquency 23 28
Delinquency Ratio 2.62% 2.25%
Consumer Loan [Member] | Other consumer [Member]
   
Delinquency ratio for consumer loan    
Dollars of Delinquency $ 28 $ 30
Delinquency Ratio 3.68% 3.17%