Divestitures Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 29, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, Plant and Equipment, Net	$ 2,708	$ 4,480
Sale Price				$ 430
(Gain) Loss from Disposition of U.S. Pressure Pumping Assets and Businesses	(96)	$ 0	$ 6
Drilling Rigs [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	276
Disposal Group, Including Discontinued Operation, Inventory, Current	64
Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, Plant and Equipment, Net	$ 19