REVENUES - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Revenue From Contract With Customer [Line Items]
Contract assets	$ 193	$ 134
Contract liabilities	91	66
Prepaid expenses and other current assets
Revenue From Contract With Customer [Line Items]
Contract assets	104	70
Other non-current assets
Revenue From Contract With Customer [Line Items]
Contract assets	89	64
Accrued expenses and other current liabilities
Revenue From Contract With Customer [Line Items]
Contract liabilities	39	32
Other non-current liabilities
Revenue From Contract With Customer [Line Items]
Contract liabilities	52	34
Contract manufacturing services
Revenue From Contract With Customer [Line Items]
Contract assets	73	47
Software sales
Revenue From Contract With Customer [Line Items]
Contract assets	38	40
Bundled equipment and consumable medical products contracts
Revenue From Contract With Customer [Line Items]
Contract assets	$ 82	$ 47