GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite other intangible assets, gross carrying amount	$ 10,741	$ 10,660
Finite other intangible assets, accumulated amortization	(5,318)	(5,161)	$ (5,318)	$ (5,161)
Finite other intangible assets, net	5,423	5,499
Other intangible assets, gross carrying amount	10,791	10,710
Other intangible assets, net	5,473	5,549
In process research and development [Member]
Indefinite-lived Intangible Assets [Line Items]
Indefinite other intangible asset, carrying amount	50	50
Developed technology
Finite-Lived Intangible Assets [Line Items]
Finite other intangible assets, gross carrying amount	3,258	3,263
Finite other intangible assets, accumulated amortization	(1,741)	(1,690)
Finite other intangible assets, net	1,517	1,573
Software
Finite-Lived Intangible Assets [Line Items]
Finite other intangible assets, gross carrying amount	1,468	1,420
Finite other intangible assets, accumulated amortization	(815)	(780)
Finite other intangible assets, net	653	640
Trademarks/tradenames
Finite-Lived Intangible Assets [Line Items]
Finite other intangible assets, gross carrying amount	692	697
Finite other intangible assets, accumulated amortization	(581)	(570)
Finite other intangible assets, net	111	127
Customer-related
Finite-Lived Intangible Assets [Line Items]
Finite other intangible assets, gross carrying amount	5,079	5,035
Finite other intangible assets, accumulated amortization	(2,021)	(1,965)
Finite other intangible assets, net	3,058	3,070
Other
Finite-Lived Intangible Assets [Line Items]
Finite other intangible assets, gross carrying amount	244	245
Finite other intangible assets, accumulated amortization	(160)	(156)
Finite other intangible assets, net	$ 84	$ 89