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Investment Securities (Details 1) (USD $)
In Millions
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 1,647 $ 2,905
Estimated Fair Value, 12 months or more 1,094 1,079
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (73) (159)
Gross Unrealized Losses, 12 months or more (174) (212)
U.S. States and Political Subdivisions Debt Securities [Member]
   
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 1,601 2,535
Estimated Fair Value, 12 months or more 1,094 1,076
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (72) (156)
Gross Unrealized Losses, 12 months or more (174) (211)
U.S. Government agency obligations [Member]
   
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 0 299
Estimated Fair Value, 12 months or more 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months 0 (1)
Gross Unrealized Losses, 12 months or more 0 0
Corporate debt securities [Member]
   
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 0 0
Estimated Fair Value, 12 months or more 0 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months 0 0
Gross Unrealized Losses, 12 months or more 0 (1)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 46 71
Estimated Fair Value, 12 months or more 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (1) (2)
Gross Unrealized Losses, 12 months or more $ 0 $ 0