INCOME TAXES - Gross Unrecognized Income Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 1,036	$ 1,001	$ 913
Increases and decreases as a result of positions taken during prior years
Transfers from valuation allowances	6	0	15
Other increases, including currency translation	22	10	22
Other decreases, including currency translation	(10)	(10)	(10)
Increases related to acquired businesses	12	7	0
Increases as a result of positions taken during the current year	75	58	80
Decreases relating to settlements with tax authorities	(11)	(26)	(16)
Decreases as a result of a lapse of the applicable statute of limitations	(10)	(4)	(3)
Balance at December 31	$ 1,120	$ 1,036	$ 1,001