Business Segment and Geographic Information (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2021		Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Revenue:
Revenue		$ 3,707		$ 3,196	$ 7,158		$ 8,233
Operating income (loss):
Impairments and other charges		0	[1]	(2,147)	0	[1]	(3,220)	[1]
Operating income		434		(1,911)	804		(2,482)
Interest expense, net of interest income		(120)		(124)	(245)		(258)
Other, net		(19)		(48)	(41)		(71)
Income (loss) from continuing operations before income taxes		295		(2,083)	518		(2,979)
Loss on early extinguishment of debt		0		0	0		168	[2]
Total operations
Operating income (loss):
Operating income		492		286	915		848
Completion and Production
Revenue:
Revenue		2,048		1,672	3,918		4,634
Operating income (loss):
Impairments and other charges				(1,400)			(2,100)
Completion and Production | Total operations
Operating income (loss):
Operating income		317		159	569		504
Drilling and Evaluation
Revenue:
Revenue		1,659		1,524	3,240		3,599
Operating income (loss):
Impairments and other charges				(770)			(1,000)
Drilling and Evaluation | Total operations
Operating income (loss):
Operating income		175		127	346		344
Corporate and Other [Member]
Operating income (loss):
Impairments and other charges				(25)			(41)
Operating income	[3]	$ (58)		$ (50)	$ (111)		$ (110)

[1] For the three and six months ended June 30, 2020, amount includes approximately $1.4 billion and $2.1 billion attributable to Completion and Production, $770 million and $1.0 billion attributable to Drilling and Evaluation, and $25 million and $41 million attributable to Corporate and other, respectively.

[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.

[3] Includes certain expenses not attributable to a 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.