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Fair Values (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Investment securities:    
Equity securities $ 484 $ 475
Debt securities and other 8,945 13,535
Derivatives 1,071 1,089
Total assets 10,500 15,099
Level 1 [Member]
   
Investment securities:    
Equity securities 484 475
Debt securities and other 0 0
Derivatives 0 0
Total assets 484 475
Level 2 [Member]
   
Investment securities:    
Equity securities 0 0
Debt securities and other 8,945 13,535
Derivatives 1,071 1,089
Total assets 10,016 14,624
Level 3 [Member]
   
Investment securities:    
Total assets $ 0 $ 0