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General Information - Additional Information (Detail)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2016
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
segment
shares
Sep. 30, 2015
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
General Information Disclosures [Line Items]          
Number of business segments | segment     2    
Common stock shares issued (in shares) | shares     4,726,529    
Proceeds as a result of the exercise and settlement of employee equity-based awards     $ 28    
Common stock cash dividend paid per share (in dollars per share) | $ / shares   $ 0.13   $ 0.09  
Common stock cash dividend paid     108 $ 74  
Excess tax benefits from equity-based awards     25    
Other Accrued Liabilities [Member]          
General Information Disclosures [Line Items]          
Increase (decrease) in litigation settlement liabilities   $ 6 6    
Accounting Standards Update 2016-09 [Member]          
General Information Disclosures [Line Items]          
Adjustment to increase (reduce) retained earnings $ (2)        
Accounting Standards Update 2016-09 [Member] | Deferred Tax Assets [Member]          
General Information Disclosures [Line Items]          
Adjustment to increase (reduce) retained earnings $ 92        
Adjustments for New Accounting Pronouncement [Member]          
General Information Disclosures [Line Items]          
Increase in deferred tax assets   89 89    
Increase (decrease) in litigation settlement liabilities         $ (30)
Increase in other accrued liabilities   $ 30 $ 30    
Secondary Public Offering [Member]          
General Information Disclosures [Line Items]          
Sale of common stock (in shares) | shares     20,000,000    
Restricted Stock [Member]          
General Information Disclosures [Line Items]          
Payment of income tax withholdings related to settlement of share based awards     $ 11