Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended
	Jan. 21, 2020	Apr. 18, 2018	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ (7)
Accumulated Deficit
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ (7)
Accumulated Deficit \| Accounting Standards Update 2016-13 [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cumulative effect of new accounting principle in period of adoption				$ (7)
Share and asset purchase agreement [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Amount paid to acquire bid			$ 2,725
Deposited in third-party escrow account			$ 200
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Percent of voting shares of successor entity received by predecessor holders			50.00%
Senior Notes [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Debt instrument interest rate	10.625%	10.625%
Debt Instrument maturity year	2024

MCDERMOTT INTERNATIONAL INC 10-Q