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SHAREHOLDERS' EQUITY - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Cumulative translation adjustments, net	$ 325	$ 273
Unrealized loss on interest rate swaps, net	(7)	(8)
Unrecognized net loss and prior service cost, net	(460)	(444)
Accumulated other comprehensive loss	(142)	(179)
Income tax benefit on cumulative translation adjustment	1	1
Income tax benefit on unrealized loss on interest rate swap securities	5	4
Income tax benefit on prior service cost and net loss	$ 124	$ 117

X

- Definition

Represents the tax benefit (expense) on the total of net gain (loss) and prior service cost (credit) included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

Represents the tax expense (benefit) on accumulated unrealized appreciation (loss) in the value of total of interest rate swap securities at the end of an accounting period.

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- Definition

Income tax benefit on cumulative translation adjustment

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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