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Business Combinations and Divestitures - Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Apr. 30, 2019	Dec. 31, 2018	Oct. 18, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses		$ 74	$ 25
Assets Held for Sale		170			$ 265
Discontinued Operations, Held-for-sale \| Land Drilling Rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets		147
Disposal Group, Including Discontinued Operation, Goodwill		3
Inventory		20
Disposal Group, Including Discontinued Operation, Liabilities, Current		$ 11			$ 17
Discontinued Operations, Held-for-sale \| Laboratory Service Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration						$ 205
Subsequent Event \| Discontinued Operations, Disposed of by Sale \| Surface Data Logging Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	$ 50
Subsequent Event \| Discontinued Operations, Disposed of by Sale \| Laboratory Service Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration				$ 206