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Employee Benefit Plans (Benefit Obligation in Excess of Plan Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Pension Benefits [Member]
   
Benefit obligation $ 4,416 [1] $ 121
Fair value of plan assets 3,903 [1] 27
Other Postretirement Benefits [Member]
   
Benefit obligation 1,375 1,583
Fair value of plan assets $ 920 $ 905
[1] The decrease primarily reflects a decrease in the discount rate as of December 31, 2011.