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Long-Term Incentive Employee Compensation - Status of Stock Option and Restricted Stock Shares (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2011
Oct. 31, 2011
Dec. 31, 2012
Dec. 31, 2010
Schedule Of Stock Options [Line Items]        
Beginning Balance, Weighted Average Exercise Price $ 16.70 $ 85.08 $ 16.70 $ 80.58
Stock Options Granted, Weighted Average Exercise Price $ 20.28 $ 115.36 $ 22.80 $ 106.60
Stock Options Exercised, Weighted Average Exercise Price $ 13.87 $ 76.27 $ 15.35 $ 62.90
Stock Options Canceled or Expired, Weighted Average Exercise Price   $ 92.76 $ 17.21 $ 97.56
Outstanding on Distribution Date before Equitable Adjustment, Weighted Average Exercise Price   $ 88.52    
Outstanding on Distribution Date after Equitable Adjustment, Weighted Average Exercise Price   $ 16.18    
Outstanding, Weighted Average Exercise Price $ 16.70 $ 16.70 $ 18.46 $ 85.08
Beginning Balance, Shares 8.0 3.7 8.0 4.0
Stock Options Granted, Shares 0.7 0.3 0.4 0.4
Stock Options Exercised, Shares (0.7) (0.7) (3.8) (0.6)
Stock Options Canceled or Expired, Shares   (1.3) (0.3) (0.1)
Outstanding on Distribution Date before Equitable Adjustment, Shares   2.0    
Outstanding on Distribution Date after Equitable Adjustment, Shares   8.0    
Stock Options Outstanding at the end of Year, Shares 8.0 8.0 4.3 3.7
Stock Options Exercisable at the end of year, Shares 6.3   2.9 3.0
Stock Options Exercisable at the end of year, Weighted Average Exercise Price $ 16.03   $ 17.10 $ 83.72