INCOME TAXES (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 1,155	$ 995	$ 944
Gross additions to tax positions related to current year	48	173	49
Gross additions to tax positions related to prior years	21	30	49
Gross additions to tax positions assumed in acquisitions	0	0	1
Gross reductions to tax positions related to prior years	(106)	(22)	(22)
Settlements	2
Settlements		(20)	(13)
Reductions to tax positions related to lapse of statute	(119)	(13)	(4)
Cumulative translation adjustment	(6)		(9)
Cumulative translation adjustment		12
Balance at end of year	995	1,155	995
Income Tax Uncertainties [Abstract]
Unrecognized tax benefits that would impact effective tax rate	853	1,002	854
Accrued interest	167	148	112
Accrued penalties	$ 11	$ 15	$ 17