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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
Goodwill [Line Items]
Goodwill			$ 25,524	$ 26,734	$ 33,974
Goodwill decrease				7,240
Goodwill impairments			1,717	1,486	22,136
Amortization of intangible assets			1,382	1,569	2,163
Additions to intangible assets			$ 420
Weighted-average amortizable period (in years)			5 years 10 months 24 days
Hydro
Goodwill [Line Items]
Goodwill impairments				742
Additive
Goodwill [Line Items]
Goodwill			$ 243
Grid Solutions equipment and services
Goodwill [Line Items]
Goodwill impairments				744
GECAS \| Operating segments \| Milestone Aviation
Goodwill [Line Items]
Goodwill						$ 729
Power
Goodwill [Line Items]
Goodwill			146	145	139
Non-cash impairment charge of intangibles	$ 113		113	103	428
Goodwill impairments			0	0
Renewable Energy
Goodwill [Line Items]
Goodwill			3,401	3,290	4,730
Goodwill impairments			0	1,486
Healthcare
Goodwill [Line Items]
Goodwill			11,855	11,728	17,226
Goodwill impairments			0	0
Aviation
Goodwill [Line Items]
Goodwill			9,247	9,859	9,839
Goodwill impairments			877	0
Aviation \| Additive \| Operating segments
Goodwill [Line Items]
Non-cash impairment charge of intangibles		$ 877
Capital
Goodwill [Line Items]
Goodwill			0	839	$ 904
Goodwill impairments			839	0
Capital \| GECAS \| Operating segments
Goodwill [Line Items]
Non-cash impairment charge of intangibles		$ 839
Capitalized software
Goodwill [Line Items]
Additions to intangible assets			$ 360
Weighted-average amortizable period (in years)			5 years 2 months 12 days
Discontinued Operations, Held-for-sale \| BioPharma Business \| Healthcare
Goodwill [Line Items]
Goodwill transfers				$ 5,548