GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Goodwill Balances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill
Balance at beginning of period			$ 26,734
Impairments	$ 0	$ (740)	(1,717)	$ (1,484)
Currency exchange and other			260
Balance at end of period	25,278		25,278
Aviation
Goodwill
Impairments			(877)
Operating Segments | Power
Goodwill
Balance at beginning of period			145
Impairments			0
Currency exchange and other			0
Balance at end of period	145		145
Operating Segments | Renewable Energy
Goodwill
Balance at beginning of period			3,290
Impairments			0
Currency exchange and other			48
Balance at end of period	3,338		3,338
Operating Segments | Aviation
Goodwill
Balance at beginning of period			9,859
Impairments			(877)
Currency exchange and other			191
Balance at end of period	9,172		9,172
Operating Segments | Healthcare
Goodwill
Balance at beginning of period			11,728
Impairments			0
Currency exchange and other			20
Balance at end of period	11,748		11,748
Operating Segments | Capital
Goodwill
Balance at beginning of period			839
Impairments			(839)
Currency exchange and other			0
Balance at end of period	0		0
Corporate
Goodwill
Balance at beginning of period			873
Impairments			0
Currency exchange and other			1
Balance at end of period	$ 874		$ 874