INCOME TAXES (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 1,905	$ 995	$ 1,155
Gross additions to tax positions related to current year	76	170	48
Gross additions to tax positions related to prior years	325	19	21
Gross additions to tax positions assumed in acquisitions	51	852	0
Gross reductions to tax positions related to prior years	(352)	(35)	(106)
Settlements	(7)	(23)
Settlements			2
Reductions to tax positions related to lapse of statute	(5)	(72)	(119)
Cumulative translation adjustment	10
Cumulative translation adjustment		(1)	(6)
Balance at end of year	2,003	1,905	995
Income Tax Uncertainties [Abstract]
Unrecognized tax benefits that would impact effective tax rate	1,900	1,809	853
Accrued interest	366	292	167
Accrued penalties	$ 20	$ 10	$ 11