Business Segment and Geographic Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Revenue		$ 4,957	$ 3,835	$ 9,236	$ 8,033
Operating income (loss):
Operating income (loss)		146	(3,880)	349	(6,959)
Impairments and other charges		(262)	(423)	(262)	(3,189)
Interest expense, net of interest income		(121)	(196)	(363)	(361)
Other, net		(26)	(31)	(44)	(78)
Income (loss) from continuing operations before income taxes		(1)	(4,107)	(58)	(7,398)
Completion and Production
Revenue:
Revenue		3,132	2,114	5,736	4,438
Operating income (loss):
Operating income (loss)		397	(32)	544	(2)
Drilling and Evaluation
Revenue:
Revenue		1,825	1,721	3,500	3,595
Operating income (loss):
Operating income (loss)		125	154	247	395
Total operations
Revenue:
Revenue		4,957	3,835	9,236	8,033
Operating income (loss):
Operating income (loss)		522	122	791	393
Corporate and other
Operating income (loss):
Operating income (loss)	[1]	$ (114)	$ (3,579)	$ (180)	$ (4,163)

[1] Includes certain expenses not attributable to a particular business segment such as costs related to support functions and corporate executives, as well as merger-related costs and termination fee incurred during the three and six months ended June 30, 2016.