Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)		3 Months Ended
	May 10, 2018	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	May 08, 2018 USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cost of operations		$ 2,028,000,000	$ 476,000,000
Selling, general and administrative expenses		72,000,000	48,000,000
Reverse stock split	three-to-one
Reverse stock split, conversion ratio	3
Restructuring and integration costs		69,000,000	12,000,000
Transaction costs		4,000,000	3,000,000
Operating lease right-of-use assets		401,000,000
Current portion of long-term lease obligations		97,000,000			$ 8,000,000
Long-term lease obligations		394,000,000			$ 66,000,000
Senior secured long-term borrowing						$ 2,260,000,000
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
ASU 2016-02 [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Operating lease right-of-use assets				$ 424,000,000
Current portion of long-term lease obligations				101,000,000
Long-term lease obligations				$ 342,000,000
Post-Combination Bid and Proposal Costs [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cost of operations		$ 26,000,000
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
Operating Income [Member] | Oil and Gas and Qingdao McDermott Wuchuan Offshore Engineering Company Ltd [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Income (loss) from investments in unconsolidated affiliates			$ (4,000,000)