FAIR VALUE MEASUREMENTS - Cross-currency Swaps, Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments or receipts in settlement of cross-currency swaps	$ 23
Cross-currency swaps \| Net Investment Hedging \| Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate notional amounts	1,250
Fair value cross-currency swaps liability, net	70	$ 13
Fair value cross-currency swaps liability	79	22
Fair value cross-currency swaps asset	$ 9	$ 9

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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The cash outflow or inflow for a financial contract that meets the hedge criteria as either a cash flow hedge, fair value hedge, or hedge of a net investment in a foreign operation.

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