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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Acquisition-related Contingent Consideration Obligations, Reconciliation of Contingent Consideration Obligations (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation |  |
Balance, beginning of period | $ 316 | $ 339
Acquisition-related contingent consideration | 26 | 2
Payments | (30) | (28)
Balance, end of period | 312 | 313
Current portion included in Accrued and other current liabilities | 37 | 46
Non-current portion | 275 | 267
Accretion for the time value of money |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation |  |
Acquisition-related contingent consideration | 17 | 16
Fair value adjustments due to changes in estimates of other future payments |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation |  |
Acquisition-related contingent consideration | $ 9 | $ (14)

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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