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Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill, Gross				$ 24,471
Accumulated impairment				(3,754)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	$ 20,396	$ 20,423	$ 20,423
Impairment	(14,717)	0
Currency exchange and others	(40)		(27)
Goodwill, net, ending balance	5,639		20,396
Oilfield Services
Goodwill [Line Items]
Goodwill, Gross				12,932
Accumulated impairment				(183)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	12,749	12,749	12,749
Impairment	(11,428)
Currency exchange and others	(2)		0
Goodwill, net, ending balance	1,319		12,749
Oilfield Equipment
Goodwill [Line Items]
Goodwill, Gross				4,177
Accumulated impairment				(867)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	3,319	3,310	3,310
Impairment	(3,289)
Currency exchange and others	(22)		9
Goodwill, net, ending balance	8		3,319
Turbo-machinery & Process Solutions
Goodwill [Line Items]
Goodwill, Gross				2,186
Accumulated impairment				0
Goodwill [Roll Forward]
Goodwill, net, beginning balance	2,171	2,186	2,186
Impairment	0
Currency exchange and others	(9)		(15)
Goodwill, net, ending balance	2,162		2,171
Digital Solutions
Goodwill [Line Items]
Goodwill, Gross				2,432
Accumulated impairment				$ (254)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	2,157	$ 2,178	2,178
Impairment	0
Currency exchange and others	(7)		(21)
Goodwill, net, ending balance	$ 2,150		$ 2,157