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Equity (Treasury Stock) - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Dec. 01, 2016
Sep. 30, 2015
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]                  
Retirement of treasury stock, shares 84,800,000                
Value of treasury stock acquired, cost method           $ 1,456,361,000 $ 93,482,000    
Treasury stock related to deferred compensation plans     $ 6,600,000   $ 6,800,000 6,600,000 900,000 $ 6,800,000  
Treasury stock, value     $ 1,795,257,000   $ 14,288,000 1,795,257,000   $ 14,288,000  
Payments for repurchase of common stock           1,606,361,000 93,482,000    
Accelerated stock repurchases settled at a later date           150,000,000      
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            
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 settled at a later date   $ 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     $ 50,100,000  
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          
Additional Paid-in Capital [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Retirement of treasury stock         (1,946,128,000)        
Accelerated stock repurchases settled at a later date           150,000,000      
Treasury Stock [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Retirement of treasury stock         $ 1,946,129,000        
Value of treasury stock acquired, cost method           $ 1,456,361,000 $ 93,482,000    
Common Stock Withheld for Settlement of Employee Tax Liabilities [Member] | Treasury Stock [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired         400,000 400,000 400,000    
Value of treasury stock acquired, cost method         $ 8,300,000 $ 10,400,000 $ 12,300,000