PROPERTY, PLANT AND EQUIPMENT AND OPERATING LEASES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization related to property, plant and equipment		$ 4,636	$ 4,026	$ 4,419
Operating lease income		3,342	3,804	4,075
Fixed lease income		2,834	3,045	3,243
Variable lease income		$ 508	$ 759	832
Operating Lease, Liability, Statement of Financial Position [Extensible List]		us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Operating lease liabilities		$ 2,973	$ 3,162
Remaining lease terms		11 years
Industrial segment
Property, Plant and Equipment [Line Items]
Operating lease liabilities		$ 3,133	3,369
Power
Property, Plant and Equipment [Line Items]
Pre-tax impairments	$ 316
Assets Leased to Others | Capital | GECAS
Property, Plant and Equipment [Line Items]
Pre-tax impairments		542	74
GE Industrial | Equipment leased to others (ELTO) | GE Capital
Property, Plant and Equipment [Line Items]
Depreciation and amortization related to property, plant and equipment		$ 2,527	$ 2,019	$ 2,089