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Capital Stock - Restricted Stock (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested at January 1, 2014, Weighted Average Grant Date Fair Value $ 81.96    
Granted, Weighted Average Grant-Date Fair Value 61.65    
Vested, Weighted Average Grant-Date Fair Value 81.14    
Forfeited, Weighted Average Grant-Date Fair Value 78.26    
Non-vested at December 31, 2014, Weighted Average Grant Date Fair Value $ 70.12 $ 81.96  
Business Performance Program [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Shares 602,000    
Forfeited or expired, Shares (101,000)    
Restricted Shares, nonvested, Ending Balance, Shares 501,000    
Granted, Weighted Average Grant-Date Fair Value $ 66.63    
Forfeited or expired, Weighted Average Grant-Date Fair Value 66.63    
Non-vested at December 31, 2014, Weighted Average Grant Date Fair Value $ 66.63    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Shares, nonvested, Beginning Balance, Shares 4,784,000    
Granted, Shares 2,976,562 3,046,744 3,098,029
Vested, Shares (1,839,000)    
Forfeited or cancelled, Shares (1,351,000)    
Restricted Shares, nonvested, Ending Balance, Shares 4,570,000 4,784,000  
Granted, Weighted Average Grant-Date Fair Value $ 61.65 $ 86.87 $ 82.95