Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Additional Information (Details)

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Goodwill and Intangible Assets - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangibles $ 134,000,000 $ 151,000,000 $ 404,000,000 $ 473,000,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Remainder of 2018 134,000,000   134,000,000  
2019 105,000,000   105,000,000  
2020 53,000,000   53,000,000  
2021 0   0  
2022 0   0  
Thereafter $ 0   $ 0