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BUSINESSES HELD FOR SALE AND DISCONTINUED OPERATIONS - Discontinued Operations, Narrative (Details) - USD ($) $ in Millions			3 Months Ended				6 Months Ended
	Aug. 31, 2019	Feb. 25, 2019	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes			$ (10)			$ 0	$ (13)	$ 3,517
Gain (loss) on disposal, net of taxes			(10)			(1)	(13)	2,553
Baker Hughes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes			(10)			0	(13)	0
Gain (loss) on disposal, net of taxes			(10)		$ (8,238)	0	(13)	0
Transportation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes			0			0	0	3,471
Gain (loss) on disposal, net of taxes			$ 0			$ 0	0	$ 2,508
Transportation \| Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes		$ 3,471
Gain (loss) on disposal, net of taxes		$ 2,508
Baker Hughes \| Baker Hughes \| Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest (as a percentage)	50.20%			36.80%
Baker Hughes excluding joint venture \| Investee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales of products and services							265
Purchases of products and services							101
Cash collected from affiliate							451
Dividend received							136
Baker Hughes excluding joint venture \| Notes Payable, Other Payables \| Baker Hughes Promissory Note \| Investee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash collected from affiliate							130
Baker Hughes \| Aeroderivative Joint Venture \| Investee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales of products and services							252
Cash collected from affiliate							$ 225