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Equity (Treasury Stock) - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]          
Payments for repurchase of common stock $ 1,175,293,000     $ 1,529,572,000  
2015 Repurchase Program [Member] | Maximum [Member]          
Equity, Class of Treasury Stock [Line Items]          
Aggregate authorized amount of common stock to be repurchased $ 1,250,000,000     $ 1,250,000,000  
2015 Repurchase Program Open Market Purchases [Member]          
Equity, Class of Treasury Stock [Line Items]          
Treasury stock acquired   19,200,000      
Value of treasury stock acquired, cost method   $ 449,900,000      
2013 Repurchase Program [Member] | Maximum [Member]          
Equity, Class of Treasury Stock [Line Items]          
Aggregate authorized amount of common stock to be repurchased         $ 500,000,000
2013 Repurchase Program Open Market Repurchases [Member]          
Equity, Class of Treasury Stock [Line Items]          
Treasury stock acquired       14,300,000  
Value of treasury stock acquired, cost method       $ 406,500,000  
Accelerated Share Repurchase Agreement [Member]          
Equity, Class of Treasury Stock [Line Items]          
Treasury stock acquired 25,700,000   9,400,000    
Value of treasury stock acquired, cost method $ 600,000,000        
Aggregate authorized amount of common stock to be repurchased 750,000,000     $ 750,000,000  
Payments for repurchase of common stock 750,000,000        
Accelerated stock repurchases not yet settled $ 150,000,000        
2015 Repurchase Plan Open Market Purchases And Accelerated Share Repurchase Agreement [Member]          
Equity, Class of Treasury Stock [Line Items]          
Treasury stock acquired     54,300,000    
Value of treasury stock acquired, cost method     $ 1,200,000,000    
Treasury stock remaining authorized repurchase amount     $ 50,100,000    
Common Stock Withheld for Settlement of Employee Tax Liabilities [Member] | Treasury Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Treasury stock acquired     362,011 352,058  
Value of treasury stock acquired, cost method     $ 7,500,000 $ 10,100,000