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Long-Term Incentive Employee Compensation (Details 1) (USD $)
In Millions, except Per Share data, unless otherwise specified
 2 Months Ended 10 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2009
Stock options outstanding rollforward            
Outstanding, shares 8.0 0 0 3.7 4.0 4.1
Outstanding, Weighted Average Exercise Price $ 16.18 $ 0 $ 0 $ 85.08 $ 80.58 $ 79.66
Stock options granted, shares 0.7 0 0 0.3 0.4 0.4
Stock options granted, Weighted Average Exercise Price $ 20.28 $ 0.00 $ 0.00 $ 115.36 $ 106.60 $ 67.18
Stock options exercised, shares (0.7) 0 0 (0.7) (0.6) (0.4)
Stock options exercised, Weighted Average Exercise Price $ 13.87 $ 0.00 $ 0.00 $ 76.27 $ 62.90 $ 52.64
Stock options cancelled or expired, shares       (1.3) (0.1) (0.1)
Stock options cancelled or expired, Weighted Average Exercise Price       $ 92.76 $ 97.56 $ 91.88
Outstanding on Distribution Date before equitable adjustment, Shares       2.0 0 0
Outstanding on Distribution Date before equitable adjustment, Weighted Average Exercise Price       $ 88.52 $ 0.00 $ 0.00
Outstanding on Distribution Date after equitable adjustment 8.0 3.7 4.0 8.0 0 0
Outstanding, Weighted Average Exercise Price $ 16.70 $ 85.08 $ 80.58 $ 16.18 $ 0 $ 0
Stock options exercisable at the end of year, shares 6.3 3.0 3.2      
Stock options exercisable at the end of year, Weighted Average Exercise Price $ 16.03 $ 83.72 $ 78.98