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Long-Term Incentive Employee Compensation - Rollforward of Outstanding Restricted Stock (Detail) (Restricted Stock [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
2 Months Ended 10 Months Ended 12 Months Ended
Oct. 31, 2011
Oct. 31, 2011
Dec. 31, 2012
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, Weighted Average Grant Date Fair Value   $ 89.70 $ 18.55 $ 88.72
Granted, Weighted Average Grant Date Fair Value $ 20.27 $ 115.18 $ 22.56 $ 106.50
Lapsed, Weighted Average Grant Date Fair Value   $ 99.53 $ 15.21 $ 108.88
Canceled, Weighted Average Grant Date Fair Value   $ 95.30 $ 20.58 $ 89.50
Outstanding, Weighted Average Grant Date Fair Value $ 18.55 $ 18.55 $ 21.06 $ 89.70
Outstanding, Weighted Average Grant Date Fair Value $ 18.55 $ 18.55 $ 21.06 $ 89.70
Beginning Outstanding, shares   0.9 1.4 0.8
Granted , shares 0.4 0.3 0.4 0.3
Lapsed, shares   (0.3) (0.5) (0.2)
Cancelled, shares   (0.6) (0.1)  
Outstanding, shares 1.4 1.4 1.2 0.9
Ending Outstanding, shares 1.4 1.4 1.2 0.9
Before Equitable Adjustment [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, Weighted Average Grant Date Fair Value $ 93.42 $ 93.42    
Outstanding, Weighted Average Grant Date Fair Value $ 93.42 $ 93.42    
Outstanding, shares 0.3 0.3    
Ending Outstanding, shares 0.3 0.3    
After Equitable Adjustment [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, Weighted Average Grant Date Fair Value $ 17.94 $ 17.94    
Outstanding, Weighted Average Grant Date Fair Value $ 17.94 $ 17.94    
Outstanding, shares 1.0 1.0    
Ending Outstanding, shares 1.0 1.0