ACQUISITIONS, GOODWILL AND OTHER INTANGIBLE ASSETS - Components of Finite-Lived Intangible Assets Acquired (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Customer-related
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 1,451
Weighted-average amortizable period (in years)	14 years 10 months 27 days
Patents and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 1,214
Weighted-average amortizable period (in years)	10 years 8 months 12 days
Capitalized software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 982
Weighted-average amortizable period (in years)	5 years 4 months 24 days
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 91
Weighted-average amortizable period (in years)	8 years 7 months 6 days
Lease valuations
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 8
Weighted-average amortizable period (in years)	10 years
All other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 19
Weighted-average amortizable period (in years)	8 years 7 months 6 days