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Debt - Summary of Long-Term Debt Obligations (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Revolving credit facility $ 801  
Less: unamortized debt issuance costs (120) $ (1)
Current debt, net of unamortized debt issuance costs 3,450 30
Less: current maturities of long-term debt (3,450) (30)
Less: unamortized debt issuance costs   (136)
Long-term debt, net of unamortized debt issuance costs   3,393
Term Facility [Member]    
Debt Instrument [Line Items]    
Long-term borrowing current 2,226 23
Long-term borrowing 2,200 2,243
10.625% Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term borrowing current 1,300  
Long-term borrowing   1,300
North Ocean 105 Construction Financing [Member]    
Debt Instrument [Line Items]    
Long-term borrowing current 12 8
Long-term borrowing   $ 16
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Revolving credit facility 801  
Structured Equipment Financing [Member]    
Debt Instrument [Line Items]    
Revolving credit facility $ 32