Business Segment and Geographic Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Revenue		$ 5,444	$ 3,833	$ 14,680	$ 11,866
Operating income (loss):
Operating income (loss)		634	128	983	(6,831)
Impairments and other charges		0	0	(262)	(3,189)
Interest expense, net of interest income		(115)	(141)	(478)	(502)
Other, net		(23)	(39)	(67)	(117)
Income (loss) from continuing operations before income taxes		496	(52)	438	(7,450)
Completion and Production
Revenue:
Revenue		3,537	2,176	9,273	6,614
Operating income (loss):
Operating income (loss)		525	24	1,069	22
Drilling and Evaluation
Revenue:
Revenue		1,907	1,657	5,407	5,252
Operating income (loss):
Operating income (loss)		180	151	427	546
Total operations
Revenue:
Revenue		5,444	3,833	14,680	11,866
Operating income (loss):
Operating income (loss)		705	175	1,496	568
Corporate and other
Operating income (loss):
Operating income (loss)	[1]	$ (71)	$ (47)	$ (251)	$ (4,210)

[1] Corporate and other includes certain expenses not attributable to a particular business segment such as costs related to support functions and corporate executives. Other items include amortization expense associated with intangible assets recorded as a result of our acquisitions in the third quarter of 2017 and merger-related costs and termination fee incurred during the nine months ended September 30, 2016.