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Equity - Treasury Stock (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended 20 Months Ended
Dec. 01, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Feb. 28, 2017
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock, value   $ 35,490,000     $ 35,490,000     $ 14,288,000  
Retirement of treasury stock, shares (in shares) 84,800,000                
Retirement of treasury stock, amount               $ 1,950,000,000  
2017 Repurchase Program                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)         0        
2017 Repurchase Program | Maximum                  
Equity, Class of Treasury Stock [Line Items]                  
Aggregate authorized amount of common stock to be repurchased   300,000,000     $ 300,000,000        
2015 Repurchase Plan Open Market Purchases And Accelerated Share Repurchase Agreement                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)         0 0     54,300,000
Treasury Stock, Value, 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       $ 1,250,000,000.00          
2015 Repurchase Program Open Market Purchases                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)             19,200,000    
Treasury Stock, Value, Acquired, Cost Method             $ 449,900,000    
Accelerated Share Repurchase Agreement                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock acquired (in shares)       25,700,000       9,400,000  
Treasury Stock, Value, Acquired, Cost Method       $ 600,000,000          
Aggregate authorized amount of common stock to be repurchased       750,000,000.0          
Payments for repurchase of common stock       750,000,000          
Accelerated stock repurchases settled at a later date       $ 150,000,000          
Treasury Stock Associated with Deferred Compensation Plans                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury Stock, Value, Acquired, Cost Method   200,000 $ 400,000   $ 3,400,000 $ 7,800,000      
Treasury stock, value   $ 17,700,000     $ 17,700,000        
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      
Treasury Stock, Value, Acquired, Cost Method         $ 17,800,000 $ 7,200,000