GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Goodwill Balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill
Balance at beginning of period			$ 26,734
Impairments	$ (1,717)	$ (744)	(1,717)	$ (744)
Currency exchange and other			(66)
Balance at end of period	24,951		24,951
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			(67)
Balance at end of period	3,223		3,223
Operating Segments | Aviation
Goodwill
Balance at beginning of period			9,859
Impairments			(877)
Currency exchange and other			8
Balance at end of period	8,989		8,989
Operating Segments | Healthcare
Goodwill
Balance at beginning of period			11,728
Impairments			0
Currency exchange and other			(4)
Balance at end of period	11,723		11,723
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			(3)
Balance at end of period	$ 871		$ 871