GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill, Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2015
Goodwill [Line Items]
Goodwill impairments (Note 8)	$ 0	$ 740,000,000		$ 1,717,000,000	$ 1,484,000,000
Goodwill	25,278,000,000			25,278,000,000		$ 26,734,000,000
Aviation
Goodwill [Line Items]
Goodwill impairments (Note 8)				877,000,000
Operating Segments | Additive Reporting Unit
Goodwill [Line Items]
Goodwill impairments (Note 8)			$ 877,000,000
Goodwill			236,000,000
Operating Segments | GECAS
Goodwill [Line Items]
Goodwill impairments (Note 8)			839,000,000
Goodwill			839,000,000
Operating Segments | Aviation
Goodwill [Line Items]
Goodwill impairments (Note 8)				877,000,000
Goodwill	9,172,000,000			9,172,000,000		9,859,000,000
Operating Segments | Capital
Goodwill [Line Items]
Goodwill impairments (Note 8)				839,000,000
Goodwill	0			0		839,000,000
Operating Segments | Capital | GECAS
Goodwill [Line Items]
Goodwill			$ 0
Corporate
Goodwill [Line Items]
Goodwill impairments (Note 8)				0
Goodwill	874,000,000			874,000,000		$ 873,000,000
Corporate | Grid Solutions Reporting Unit
Goodwill [Line Items]
Goodwill	$ 874,000,000			$ 874,000,000
Milestone Aviation | Operating Segments | GECAS
Goodwill [Line Items]
Goodwill							$ 729,000,000