INCOME TAXES (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 1,002	$ 854	$ 671
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	995	944	934
Gross additions to tax positions related to current year	173	49	52
Gross additions to tax positions related to prior years	30	49	56
Gross additions to tax positions assumed in acquisitions		1	1
Gross reductions to tax positions related to prior years	(22)	(22)	(34)
Settlements	(20)	(13)	(46)
Reductions to tax positions related to lapse of statute	(13)	(4)	(9)
Cumulative translation adjustment	12
Cumulative translation adjustment		(9)	(10)
Balance at end of year	1,155	995	944
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
Accrued interest	148	112	93
Accrued penalties	15	$ 17	$ 16
Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in total amount of unrecognized tax benefits	255
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in total amount of unrecognized tax benefits	$ 315