BASIS OF PRESENTATION Operating Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Operating Leased Assets [Line Items]
Goodwill acquired	$ 118
Cumulative effect of change in accounting standards		$ 17
Operating lease right-of-use assets	746
Operating lease liabilities	762
Accounting Standards Update 2016-02
Operating Leased Assets [Line Items]
Operating lease right-of-use assets	734
Operating lease liabilities	$ 749
Retained Earnings
Operating Leased Assets [Line Items]
Cumulative effect of change in accounting standards		12
Retained Earnings | Accounting Standards Update 2016-02
Operating Leased Assets [Line Items]
Cumulative effect of change in accounting standards		$ 12