CONTRACT ASSETS AND CONTRACT LIABILITIES - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Contract Assets
Balance at beginning of year	$ 544	$ 623
Acquisitions	0	4
Recognized in current year	617	850
Reclassified to accounts receivable	(602)	(950)
Foreign currency impact	(14)	17
Balance at end of year	545	544
Contract Liabilities
Balance at beginning of year	832	800
Acquisitions	2	7
Recognized in current year	740	872
Amounts in beginning balance reclassified to revenue	(463)	(532)
Current year amounts reclassified to revenue	(273)	(326)
Foreign currency impact	(14)	11
Balance at end of year	$ 824	$ 832