OPERATING SEGMENTS - Equipment and Services Revenues Classification (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Consolidated revenues	$ 20,303	$ 18,569	$ 18,253	$ 17,071	$ 21,033	$ 18,609	$ 16,811	$ 19,380	$ 74,196	$ 75,833	$ 90,221
Aviation
Segment Reporting Information [Line Items]
Consolidated revenues									20,274	20,597	32,117
Healthcare
Segment Reporting Information [Line Items]
Consolidated revenues									17,724	18,008	19,942
Renewable Energy
Segment Reporting Information [Line Items]
Consolidated revenues									15,559	15,523	15,198
Power
Segment Reporting Information [Line Items]
Consolidated revenues									16,558	17,237	18,267
Operating segments
Segment Reporting Information [Line Items]
Consolidated revenues									71,635	73,306	86,778
Operating segments | Aviation
Segment Reporting Information [Line Items]
Consolidated revenues									21,310	22,042	32,875
Operating segments | Healthcare
Segment Reporting Information [Line Items]
Consolidated revenues									17,725	18,009	19,942
Operating segments | Renewable Energy
Segment Reporting Information [Line Items]
Consolidated revenues									15,697	15,666	15,337
Operating segments | Power
Segment Reporting Information [Line Items]
Consolidated revenues									16,903	17,589	18,625
Equipment | Operating segments
Segment Reporting Information [Line Items]
Consolidated revenues									34,894	38,140	42,837
Equipment | Operating segments | Aviation
Segment Reporting Information [Line Items]
Consolidated revenues									7,531	8,582	12,737
Equipment | Operating segments | Healthcare
Segment Reporting Information [Line Items]
Consolidated revenues									9,104	9,992	11,585
Equipment | Operating segments | Renewable Energy
Segment Reporting Information [Line Items]
Consolidated revenues									13,224	12,859	12,267
Equipment | Operating segments | Power
Segment Reporting Information [Line Items]
Consolidated revenues									5,035	6,707	6,247
Services | Operating segments
Segment Reporting Information [Line Items]
Consolidated revenues									36,741	35,166	43,942
Services | Operating segments | Aviation
Segment Reporting Information [Line Items]
Consolidated revenues									13,780	13,460	20,138
Services | Operating segments | Healthcare
Segment Reporting Information [Line Items]
Consolidated revenues									8,620	8,017	8,357
Services | Operating segments | Renewable Energy
Segment Reporting Information [Line Items]
Consolidated revenues									2,473	2,807	3,069
Services | Operating segments | Power
Segment Reporting Information [Line Items]
Consolidated revenues									$ 11,868	$ 10,883	$ 12,378