Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)		3 Months Ended			9 Months Ended
	May 09, 2018	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	May 08, 2018 USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cost of operations		$ 2,016,000,000		$ 774,000,000	$ 3,990,000,000	$ 1,853,000,000
Selling, general and administrative expenses		64,000,000		55,000,000	188,000,000	142,000,000
Loss from investments in unconsolidated affiliates						(2,000,000)
Reverse stock split	three-to-one
Reverse stock split, conversion ratio	3
Senior secured long-term borrowing							$ 2,260,000,000
Provision for income tax benefit at statutory income tax rate					117,000,000
ASU 2016-16 [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Provision for income tax benefit at statutory income tax rate			$ 117,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Interest rate derivatives							$ 1,940,000,000
Post-Combination Bid and Proposal Costs [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cost of operations		$ 20,000,000			37,000,000
Pre-Combination Bid and Proposal Costs [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Selling, general and administrative expenses				10,000,000	$ 10,000,000	26,000,000
Oil and Gas and Qingdao McDermott Wuchuan Offshore Engineering Company Ltd [Member] | Operating Income [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Loss from investments in unconsolidated affiliates				$ 3,000,000		$ 9,000,000