Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Balance at December 31, 2019, gross						$ 24,444
Accumulated impairment at December 31, 2019						(3,754)
Goodwill [Roll Forward]
Goodwill, net, beginning balance			$ 5,977	$ 20,690	$ 20,690
Impairment	$ 0	$ 0	0	(14,773)	(14,773)
Currency exchange and others			75		60
Goodwill, net, ending balance	6,052		6,052		5,977
Oilfield Services
Goodwill [Line Items]
Balance at December 31, 2019, gross						15,676
Accumulated impairment at December 31, 2019						(2,633)
Goodwill [Roll Forward]
Goodwill, net, beginning balance			1,539	13,043	13,043
Impairment					(11,484)
Currency exchange and others			1		(20)
Goodwill, net, ending balance	1,540		1,540		1,539
Oilfield Equipment
Goodwill [Line Items]
Balance at December 31, 2019, gross						4,186
Accumulated impairment at December 31, 2019						(867)
Goodwill [Roll Forward]
Goodwill, net, beginning balance			6	3,319	3,319
Impairment					(3,289)
Currency exchange and others			(3)		(24)
Goodwill, net, ending balance	3		3		6
Turbo- machinery & Process Solutions
Goodwill [Line Items]
Balance at December 31, 2019, gross						2,171
Accumulated impairment at December 31, 2019						0
Goodwill [Roll Forward]
Goodwill, net, beginning balance			2,234	2,171	2,171
Impairment					0
Currency exchange and others			1		63
Goodwill, net, ending balance	2,235		2,235		2,234
Digital Solutions
Goodwill [Line Items]
Balance at December 31, 2019, gross						2,411
Accumulated impairment at December 31, 2019						$ (254)
Goodwill [Roll Forward]
Goodwill, net, beginning balance			2,198	$ 2,157	2,157
Impairment					0
Currency exchange and others			76		41
Goodwill, net, ending balance	$ 2,274		$ 2,274		$ 2,198