BUSINESSES HELD FOR SALE AND DISCONTINUED OPERATIONS - Discontinued Operations, Narrative (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Aug. 31, 2019	Feb. 25, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes				$ (31)	$ (5,183)	$ 4
Gain (loss) on disposals, net of taxes				(32)	(5,675)	3
Baker Hughes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes				(23)	(8,715)	0
Gain (loss) on disposals, net of taxes				(23)	(8,238)	0
Baker Hughes | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes			$ (8,715)
Gain (loss) on disposals, net of taxes			$ (8,238)
Transportation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes				(12)	3,471	0
Gain (loss) on disposals, net of taxes				(12)	$ 2,508	$ 0
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 disposals, 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%
Ownership interest (as a percentage)			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				839
Net cash collected from affiliate				855
Purchases of products and services				216
Baker Hughes | Investee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Dividends received				267
Baker Hughes | Notes Payable, Other Payables | Baker Hughes Promissory Note | Investee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash collected from affiliate				204
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				563
Net cash collected from affiliate				$ 603