Goodwill and Intangible Assets - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) segment reporting_unit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 03, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reportable segments | segment	4
Number of reporting units | reporting_unit	4
Indefinite-lived intangible assets	$ 2,222	$ 2,197
Amortization expense for intangible assets	$ 455	387	$ 239
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated weighted average life (years)	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated weighted average life (years)	30 years
GE Transaction Agreement | Trademarks - Baker Hughes
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets		$ 2,100		$ 2,100
Discount rate | Income approach valuation technique | Minimum
Finite-Lived Intangible Assets [Line Items]
Discount rates	0.10
Discount rate | Income approach valuation technique | Maximum
Finite-Lived Intangible Assets [Line Items]
Discount rates	0.115