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Goodwill and Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill impairment charges $ 0 $ 0 $ 0
Future Amortization Expenses      
Future amortization expense, 2017 35,000,000    
Future amortization expense, 2018 33,000,000    
Future amortization expense, 2019 27,000,000    
Future amortization expense, 2020 19,000,000    
Future amortization expense, 2021 $ 8,000,000    
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Weighted average amortization period 2 years    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Weighted average amortization period 15 years