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BUSINESSES HELD FOR SALE AND DISCONTINUED OPERATIONS - Discontinued Operations, Narrative (Details) - USD ($) $ in Millions			3 Months Ended
	Aug. 31, 2019	Feb. 25, 2019	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal before income taxes			$ (4)		$ 3,518
Gain (loss) on disposal, net of taxes			(4)		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			(4)		0
Gain (loss) on disposal, net of taxes			(4)	$ (8,238)	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		3,471
Gain (loss) on disposal, net of taxes			$ 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)			36.80%
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%
Investee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales of products and services			$ 290
Purchases of products and services			36
Cash collected from affiliate			415
Dividend received			68
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			$ 106