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Business Combinations and Divestitures Carrying amount of Held-for-Sale (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2019	Dec. 29, 2017
Asset Impairment Charges			$ 20
Disposal Group, Including Discontinued Operation, Assets, Current		$ 265
Disposal Group, Including Discontinued Operation, Consideration					$ 430
Business Operations Held for Sale [Member]
Impairment of Long-Lived Assets to be Disposed of		18
Land Drilling Rig [Member]
Asset Impairment Charges	$ 58
Discontinued Operations, Held-for-sale [Member] \| Business Operations Held for Sale [Member]
Disposal Group, Including Discontinued Operation, Liabilities, Current		$ 17
Discontinued Operations, Held-for-sale [Member] \| Laboratory Service Business [Member]
Disposal Group, Including Discontinued Operation, Consideration				$ 206
Reclassified to Held for Use [Member] \| Business Operations Reclassified to Held for Use [Member]
Disposal Group, Including Discontinued Operation, Assets, Current				$ 53