Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Revenue		$ 14,445	$ 22,408	$ 23,995
Operating costs and expenses:
Impairments and other charges	[1]	3,799	2,506	265
General and administrative		182	227	254
Total operating costs and expenses		16,881	22,856	21,528
Operating income (loss)		(2,436)	(448)	2,467
Interest expense, net of interest income		(505)	(569)	(554)
Other, net		(111)	(105)	(99)
Income (loss) from continuing operations before income taxes		(3,220)	(1,122)	1,814
Income tax benefit (provision)		278	(7)	(157)
Net income (loss)		(2,942)	(1,129)	1,657
Net (income) loss attributable to noncontrolling interest		(3)	(2)	(1)
Net income (loss) attributable to company		(2,945)	(1,131)	1,656
Amounts attributable to company shareholders:
Net income (loss) attributable to company		$ (2,945)	$ (1,131)	$ 1,656
Basic and diluted income (loss) per share attributable to company shareholders:
Net income (loss) per share (in dollars per share)		$ (3.34)	$ (1.29)	$ 1.89
Basic weighted average common shares outstanding		881	875	875
Diluted weighted average common shares outstanding		881	875	877
Services [Member]
Revenue:
Revenue		$ 10,203	$ 16,884	$ 18,444
Operating costs and expenses:
Cost of services and sales		9,458	15,684	16,591
Product sales [Member]
Revenue:
Revenue		4,242	5,524	5,551
Operating costs and expenses:
Cost of services and sales		$ 3,442	$ 4,439	$ 4,418

[1] Impairments and other charges are as follows:     -For the year ended December 31, 2020, amount includes approximately $2.4 billion attributable to Completion and Production, $1.4 billion attributable to Drilling and Evaluation, and $62 million attributable to Corporate and other. -For the year ended December 31, 2019, amount includes approximately $1.6 billion attributable to Completion and Production, $849 million attributable to Drilling and Evaluation, and $56 million attributable to Corporate and other.     -For the years ended December 31, 2018, we recorded aggregate charges of $265 million to write-down our investment in Venezuela.