Business Segment and Geographic Information (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Revenue:
Revenue		$ 3,196		$ 5,930		$ 8,233	$ 11,667
Operating income (loss):
Impairments and other charges		(2,147)	[1]	(247)	[1]	(3,220)	(308)
Operating income		(1,911)		303		(2,482)	668
Interest expense, net of interest income		(124)		(144)		(258)	(287)
Other, net		(48)		(8)		(71)	(38)
Income (loss) from continuing operations before income taxes		(2,083)		151		(2,979)	343
Loss on early extinguishment of debt		0	[2]	0		(168)	0
Long-term Debt, Excluding Current Maturities		1,500				1,500
Completion and Production
Revenue:
Revenue		1,672		3,805		4,634	7,467
Operating income (loss):
Impairments and other charges		(1,400)		(77)		(2,100)	(127)
Operating income		159		470		504	838
Drilling and Evaluation
Revenue:
Revenue		1,524		2,125		3,599	4,200
Operating income (loss):
Impairments and other charges		(770)		(142)		(1,000)	(153)
Operating income		127		145		344	268
Total operations
Revenue:
Revenue		3,196		5,930		8,233	11,667
Operating income (loss):
Operating income		286		615		848	1,106
Corporate and other
Operating income (loss):
Operating income	[3]	(50)		(65)		(110)	(130)
Corporate and Other [Member]
Operating income (loss):
Impairments and other charges		$ (25)		$ (28)		$ (41)	$ (28)

[1] For the three months ended June 30, 2020, amount includes approximately $1.4 billion attributable to Completion and Production, $770 million attributable to Drilling and Evaluation, and $25 million attributable to Corporate and other. For the three months ended June 30, 2019, amount includes $77 million attributable to Completion and Production, $142 million attributable to Drilling and Evaluation, and $28 million attributable to Corporate and other. For the six months ended June 30, 2020, amount includes $2.1 billion attributable to Completion and Production, $1.0 billion attributable to Drilling and Evaluation, and $41 million attributable to Corporate and other. For the six months ended June 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. See Note 2 for further discussion on these impairments and other charges.

[2] For the six months ended June 30, 2020, amount includes a $168 million loss on extinguishment of debt related to the early repurchase of senior notes. See Note 6 for further discussion on this charge.

[3] Includes certain expenses not attributable to a particular business segment, such as costs related to support functions and corporate executives, and also includes amortization expense associated with intangible assets recorded as a result of acquisitions.