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Business Combinations and Divestitures - Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Businesses, Net		$ 319	$ 37
Assets Held for Sale	$ 5	5		$ 265
Discontinued Operations, Held-for-sale \| Land Drilling Rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Liabilities, Current				$ 17
Discontinued Operations, Held-for-sale \| Laboratory Service Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	61	61
Disposal Group, Including Discontinued Operation, Consideration	206	206
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]
Disposal Group, Including Discontinued Operation, Assets	34	34
Proceeds from Sale of Businesses, Net	50
Reclassified to Held for Use [Member] \| Business Operations Reclassified to Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	$ 53	$ 53