CONTRACT ASSETS AND CONTRACT LIABILITIES - Change in Carrying Amount of Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Contract Assets
Balance at beginning of year	$ 545	$ 544
Recognized in current year	165	233
Reclassified to accounts receivable	(140)	(242)
Foreign currency impact	(2)	(5)
Balance at end of period	568	530
Contract Liabilities
Balance at beginning of year	824	832
Acquisitions	0	2
Recognized in current year	231	234
Amounts in beginning balance reclassified to revenue	(191)	(214)
Current year amounts reclassified to revenue	(44)	(11)
Foreign currency impact	(4)	(10)
Balance at end of period	$ 816	$ 833