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Related Party Transactions - Narrative (Details) $ in Millions					9 Months Ended	12 Months Ended
	Nov. 01, 2019 USD ($)	Aug. 31, 2019	Feb. 28, 2019 USD ($)	Jan. 01, 2019 USD ($)	Sep. 30, 2019	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 31, 2019 USD ($) joint_venture	May 01, 2019 USD ($)
Related Party Transaction [Line Items]
Number Of Joint Ventures \| joint_venture									3
Party interests			50.00%
Current receivables						$ 6,814.0	$ 6,389.0
GE Transaction Agreement
Related Party Transaction [Line Items]
Interest in acquiree held prior to combination			$ 60.0
Accounts Payable, GE and its affiliates
Related Party Transaction [Line Items]
Accounts payable, related party						536.0	538.0
GE Capital accounts payable program
Related Party Transaction [Line Items]
Accounts payable, related party						38.0	471.0
Related parties
Related Party Transaction [Line Items]
Current receivables						570.0	746.0
GE \| GE’s corporate overhead
Related Party Transaction [Line Items]
Selling, general and administrative expenses, agreement				$ 27.5		55.0
Selling, general and administrative expenses, agreement, service increase (decrease)				(50.00%)
GE \| Sales of products and services, GE and its affiliates
Related Party Transaction [Line Items]
Revenue from related parties						337.0	363.0	$ 639.0
GE \| Purchases, GE and its affiliates
Related Party Transaction [Line Items]
Related party purchases						$ 1,498.0	1,791.0	$ 1,512.0
GE \| Operations and pricing levels, control upgrade services
Related Party Transaction [Line Items]
Related party transaction, term						4 years
GE \| Related party amount, due to related party
Related Party Transaction [Line Items]
Cash held on behalf of GE						$ 273.0	896.0
Cash						162.0	747.0
GE \| Related parties
Related Party Transaction [Line Items]
Current receivables						495.0	653.0
GE \| Angola Bonds \| Related party amount, due to related party
Related Party Transaction [Line Items]
Investment securities						111.0	149.0
Baker Hughes Incorporated [Member] \| Related parties
Related Party Transaction [Line Items]
Current receivables						$ 75.0	$ 93.0
General Electric Company \| Baker Hughes Incorporated [Member] \| Class B
Related Party Transaction [Line Items]
Approximate interest		50.30%			36.80%
BHGE LLC
Related Party Transaction [Line Items]
Contingent consideration, asset									$ 50.0
BHGE LLC \| Aero Products and Services JV, LLC
Related Party Transaction [Line Items]
Payments to acquire interest in joint venture	$ 289.0
BHGE LLC \| GE \| Industrial Steam Turbine (IST) sale agreement with GE
Related Party Transaction [Line Items]
Due to affiliate										$ 13.0
BHGE LLC \| GE \| Long-term supply arrangement, heavy-duty gas turbine units
Related Party Transaction [Line Items]
Related party transaction, term						5 years
BHGE LLC \| GE \| Long-term supply arrangement, associated services
Related Party Transaction [Line Items]
Related party transaction, term						20 years