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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 113.0 $ 109.0 $ 116.0
Deferred compensation costs related to unvested awards $ 116.0 114.0  
Deferred compensation costs related to unvested awards, weighted average period 2 years    
Tax benefit (costs) from share-based compensation in financing activities $ 34.0 92.0 121.0
Proceeds from exercise of stock options granted under share-based payment arrangements $ 6.0 $ 86.0 78.0
Shares reserved under the stock plan 24,000,000    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 1,300,000    
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service and performance RSUs granted 100,000    
SARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 300,000    
Service and performance RSUs granted 5,600,000 5,800,000  
Share-based compensation expense $ 7.0 $ 8.0 12.0
Deferred compensation costs related to unvested awards 3.0 3.0  
Intrinsic value of stock appreciation rights outstanding 232.0 264.0  
Intrinsic value of stock appreciation rights exercisable 209.0 197.0  
Intrinsic value of stock appreciation rights exercised $ 23.0 $ 33.0  
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 1,400,000    
Service and performance RSUs granted 4,900,000 6,000,000  
Share-based compensation expense $ 103.0 $ 98.0 $ 101.0
Deferred compensation costs related to unvested awards $ 112.0 $ 109.0  
Vesting period 4 years    
Weighted average remaining term for grants outstanding 2 years    
Performance RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Stock Option Program and SAR Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved under the stock plan 6,000,000    
Employee | SARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 300,000 300,000 700,000
Vesting period 4 years    
Expiration period 10 years    
Director | SARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 2,773 3,277 5,903
Expiration period 10 years    
Period until exercisable 1 year    
Director | Deferred Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 15,000 21,000 31,000
Share-based compensation expense $ 1.1 $ 1.2 $ 1.4
Vesting period 1 year    
Outstanding units at year-end 261,000 268,000  
Weighted average grant-date fair value per share of deferred stock units outstanding as of year end $ 33 $ 30