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Income Taxes - Domestic and Foreign (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 21, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]              
Tax cuts and jobs act, provisional income tax benefit     $ 198        
Tax cuts and jobs act, change in tax rate, provisional tax benefit     $ 210        
U.S. federal statutory income tax rate 21.00%     21.00% 35.00% 35.00% 35.00%
Tax cuts and jobs act, transition tax, provisional income tax expense         $ 12    
Tax cuts and jobs act, measurement period adjustment, income tax benefit   $ 2          
Tax cuts and jobs act, measurement period adjustment, change in tax rate, income tax benefit   5          
Tax cuts and jobs act, measurement period adjustment, reduction in transition tax   1          
Tax cuts and jobs act, measurement period adjustment, deductible expenses   $ 4          
Domestic loss       $ (411) (91)   $ (1,329)
Foreign income       16 75   102
Income (Loss) Before Income Taxes       $ (395) $ (16)   $ (1,227)