GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill, Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2015	Dec. 31, 2019
Goodwill [Line Items]
Goodwill impairments (Note 8)	$ 1,717,000,000	$ 744,000,000	$ 1,717,000,000	$ 744,000,000
Goodwill	24,951,000,000		24,951,000,000			$ 26,734,000,000
Operating Segments | Aviation
Goodwill [Line Items]
Goodwill impairments (Note 8)			877,000,000
Goodwill	8,989,000,000		8,989,000,000			9,859,000,000
Operating Segments | Aviation | Additive Reporting Unit
Goodwill [Line Items]
Goodwill impairments (Note 8)			877,000,000
Goodwill	222,000,000		222,000,000
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 impairments (Note 8)			839,000,000
Goodwill	0		0
Corporate
Goodwill [Line Items]
Goodwill impairments (Note 8)			0
Goodwill	871,000,000		871,000,000			$ 873,000,000
Corporate | Grid Solutions Reporting Unit
Goodwill [Line Items]
Goodwill	$ 871,000,000		$ 871,000,000
Milestone Aviation | Operating Segments | Capital | GECAS
Goodwill [Line Items]
Goodwill impairments (Note 8)					$ 729,000,000