Business Segment and Geographic Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Revenue		$ 5,550	$ 6,172	$ 17,217	$ 18,059
Operating income (loss):
Impairments and other charges	[1]	0	0	(308)	(265)
Operating income		536	716	1,204	1,859
Interest expense, net of interest income		(141)	(140)	(428)	(417)
Other, net		(23)	(42)	(61)	(86)
Income (loss) from continuing operations before income taxes		372	534	715	1,356
Completion and Production
Revenue:
Revenue		3,506	4,170	10,973	12,141
Operating income (loss):
Impairments and other charges	[1]			(127)
Operating income		446	613	1,284	1,782
Drilling and Evaluation
Revenue:
Revenue		2,044	2,002	6,244	5,918
Operating income (loss):
Impairments and other charges	[1]			(153)
Operating income		150	181	418	560
Total operations
Revenue:
Revenue		5,550	6,172	17,217	18,059
Operating income (loss):
Operating income		596	794	1,702	2,342
Corporate and other
Operating income (loss):
Operating income	[2]	$ (60)	$ (78)	(190)	$ (218)
Corporate and other
Operating income (loss):
Impairments and other charges	[1]			$ (28)

[1] For the nine months ended September 30, 2019, amount includes $127 million attributable to Completion and Production, $153 million attributable to Drilling and Evaluation, and $28 million attributable to Corporate and other. During the nine months ended September 30, 2018, we recognized a pre-tax charge of $265 million related to a write-down of all of our remaining investment in Venezuela. See Note 2 for further discussion on these impairments and other charges. There were no such impairments and other charges recorded during the three months ended September 30, 2019 or 2018.

[2] Corporate and other includes certain expenses not attributable to a particular business segment, such as costs related to support functions and corporate executives.