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Equity (Treasury Stock) - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Dec. 01, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items]              
Treasury stock, value   $ 34,528,000       $ 14,288,000 $ 14,288,000
Retirement of treasury stock, shares 84,800,000            
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      
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      
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   0 $ 0       $ 1,200,000,000
Treasury Stock Associated with Deferred Compensation Plans [Member]              
Equity, Class of Treasury Stock [Line Items]              
Value of treasury stock acquired, cost method   3,200,000 $ 7,400,000        
Treasury stock, value   $ 17,500,000          
Treasury Stock [Member]              
Equity, Class of Treasury Stock [Line Items]              
Retirement of treasury stock           $ 1,950,000,000  
Common Stock Withheld for Settlement of Employee Tax Liabilities [Member] | Treasury Stock [Member]              
Equity, Class of Treasury Stock [Line Items]              
Treasury stock acquired   500,000 300,000        
Value of treasury stock acquired, cost method   $ 17,100,000 $ 7,100,000