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Equity - Treasury Stock (Detail) - USD ($)
 3 Months Ended 12 Months Ended 20 Months Ended
Dec. 01, 2016
Jun. 30, 2016
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 28, 2017
Jun. 30, 2017
Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]                  
Value of treasury stock acquired, cost method       $ 50,000,000   $ 1,456,361,000      
Treasury stock, value       85,451,000 $ 14,288,000        
Retirement of treasury stock, shares (in shares) 84,800,000                
Retirement of treasury stock, amount         0        
Payments for repurchase of common stock       $ 50,000,000 $ 0 1,606,361,000      
Accelerated stock repurchases settled at a later date           $ 150,000,000      
2017 Repurchase Program                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)       1,382,292          
Value of treasury stock acquired, cost method       $ 50,000,000          
2017 Repurchase Program | Maximum                  
Equity, Class of Treasury Stock [Line Items]                  
Aggregate authorized amount of common stock to be repurchased               $ 300,000,000.0  
2015 Repurchase Plan Open Market Purchases And Accelerated Share Repurchase Agreement                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)             54,300,000    
Value of treasury stock acquired, cost method             $ 1,200,000,000    
2015 Repurchase Program | Maximum                  
Equity, Class of Treasury Stock [Line Items]                  
Aggregate authorized amount of common stock to be repurchased     $ 1,250,000,000            
2015 Repurchase Program Open Market Purchases                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)           19,200,000      
Value of treasury stock acquired, cost method           $ 449,900,000      
Accelerated Share Repurchase Agreement                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)   9,400,000 25,700,000            
Aggregate authorized amount of common stock to be repurchased     $ 750,000,000            
Payments for repurchase of common stock     $ 750,000,000            
2013 Repurchase Program | Maximum                  
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                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)           14,300,000      
Value of treasury stock acquired, cost method           $ 406,500,000      
Common Stock Withheld for Settlement of Employee Tax Liabilities                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)       500,000 400,000 400,000      
Value of treasury stock acquired, cost method       $ 18,600,000 $ 8,300,000 $ 10,400,000      
Treasury Stock Associated with Deferred Compensation Plans                  
Equity, Class of Treasury Stock [Line Items]                  
Value of treasury stock acquired, cost method       2,600,000 6,800,000 6,600,000      
Treasury stock, value       16,900,000          
Treasury Stock                  
Equity, Class of Treasury Stock [Line Items]                  
Value of treasury stock acquired, cost method       $ 50,000,000   $ 1,456,361,000      
Retirement of treasury stock, amount         $ 1,946,129,000