INCOME TAXES - Summary of Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 663	$ 412	$ 278
Provision	7,257	5,839	3,687
Utilization	(7,170)	(5,601)	(3,667)
Foreign currency translation	(6)	13	(2)
Balance at end of year	744	663	412
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	2,809	2,844	3,193
Provision	201	62	75
Utilization	(1,087)	(488)	(423)
Foreign currency translation	(157)	212	(132)
Acquisitions/(dispositions)/(liquidations), net	(720)	179	228
Non U.S. rate change	10	0	(97)
Balance at end of year	$ 1,056	$ 2,809	$ 2,844