GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Goodwill Balances (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill
Balance at beginning of period	$ 26,734
Dispositions and classification to held for sale	0
Currency exchange and other	(136)
Balance at end of period	26,598
Operating Segments | Power
Goodwill
Balance at beginning of period	145
Dispositions and classification to held for sale	0
Currency exchange and other	0
Balance at end of period	145
Operating Segments | Renewable Energy
Goodwill
Balance at beginning of period	3,290
Dispositions and classification to held for sale	0
Currency exchange and other	(74)
Balance at end of period	3,216
Operating Segments | Aviation
Goodwill
Balance at beginning of period	9,859
Dispositions and classification to held for sale	0
Currency exchange and other	(41)
Balance at end of period	9,818
Operating Segments | Healthcare
Goodwill
Balance at beginning of period	11,728
Dispositions and classification to held for sale	0
Currency exchange and other	(17)
Balance at end of period	11,711
Operating Segments | Capital
Goodwill
Balance at beginning of period	839
Dispositions and classification to held for sale	0
Currency exchange and other	0
Balance at end of period	839
Corporate
Goodwill
Balance at beginning of period	873
Dispositions and classification to held for sale	0
Currency exchange and other	(5)
Balance at end of period	$ 869