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Postretirement Benefit Plans (Details 6) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Pension plans with an accumulated benefit obligation in excess of plan assets    
Projected benefit obligation $ 328 $ 299
Accumulated benefit obligation 328 297
Fair value of plan assets $ 182 [1] $ 187
[1] Shares issued and outstanding include unvested restricted common stock of 0.5 and 0.6 at December 31, 2011 and 2010, respectively.