Assets and Liabilities of Business Held for Sale - Narrative (Details) $ in Millions	Mar. 31, 2021 USD ($)
Subsea Drilling Systems | Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration	$ 200
Cash consideration	$ 120
Joint Venture Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Joint venture ownership percentage	50.00%
Joint Venture Company | Akastor ASA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Joint venture ownership percentage	50.00%