Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue
Revenue	$ 6,090	$ 8,479	$ 8,453
Cost of revenue
Cost of revenue	5,656	7,634	7,009
Gross profit	434	845	1,444
Selling, general and administrative	968	1,303	1,233
Goodwill and indefinite-lived intangible asset impairment	1,378	3,612
Long-lived asset impairment	513	2,209
Operating profit (loss)	(2,425)	(6,279)	211
Interest and financial costs	(84)	(100)	(93)
Interest income	7	20	25
Equity loss in unconsolidated affiliates	(260)	(13)	(3)
Other income (expense), net	(17)	(90)	(99)
Income (loss) before income taxes	(2,779)	(6,462)	41
Provision (benefit) for income taxes	(242)	(369)	63
Net loss	(2,537)	(6,093)	(22)
Net income attributable to noncontrolling interests	5	2	9
Net loss attributable to Company	$ (2,542)	$ (6,095)	$ (31)
Net loss attributable to Company per share:
Basic	$ (6.62)	$ (15.96)	$ (0.08)
Diluted	(6.62)	(15.96)	(0.08)
Cash dividends per share	$ 0.05	$ 0.20	$ 0.20
Weighted average shares outstanding:
Basic	384	382	378
Diluted	384	382	378
Sales [Member]
Revenue
Revenue	$ 4,409	$ 5,862	$ 5,699
Cost of revenue
Cost of revenue	4,313	5,696	4,883
Service [Member]
Revenue
Revenue	1,091	1,517	1,612
Cost of revenue
Cost of revenue	929	1,188	1,257
Rental [Member]
Revenue
Revenue	590	1,100	1,142
Cost of revenue
Cost of revenue	$ 414	$ 750	$ 869