Business Segment and Geographic Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020
Revenue:
Revenue		$ 3,451		$ 5,037
Operating income (loss):
Impairments and other charges		0	[1]	(1,073)
Operating income		370		(571)
Interest expense, net of interest income		(125)		(134)
Other, net		(22)		(23)
Income (loss) from continuing operations before income taxes		223		(896)
Loss on early extinguishment of debt		0		168	[2]
Total operations
Operating income (loss):
Operating income		423		562
Completion and Production
Revenue:
Revenue		1,870		2,962
Operating income (loss):
Impairments and other charges				(780,000)
Completion and Production | Total operations
Operating income (loss):
Operating income		252		345
Drilling and Evaluation
Revenue:
Revenue		1,581		2,075
Operating income (loss):
Impairments and other charges				(277)
Drilling and Evaluation | Total operations
Operating income (loss):
Operating income		171		217
Corporate and Other [Member]
Operating income (loss):
Impairments and other charges				(16)
Operating income	[3]	$ (53)		$ (60)

[1] For the three months ended March 31, 2020, amount includes approximately $780 million attributable to Completion and Production, $277 million attributable to Drilling and Evaluation, and $16 million attributable to Corporate and other.

[2] For the three months ended March 31, 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.