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STOCK-BASED COMPENSATION - Pre-tax Compensation Expense and the Related Income Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based compensation
Pre-tax compensation expense	$ 43	$ 31	$ 25
Long-term stock awards
Stock-based compensation
Pre-tax compensation expense	14	20	20
Stock options
Stock-based compensation
Pre-tax compensation expense	7	4	3
Restricted stock units
Stock-based compensation
Pre-tax compensation expense	13	0	0
Performance restricted stock units
Stock-based compensation
Pre-tax compensation expense	5	3	4
Phantom stock awards and stock appreciation rights
Stock-based compensation
Pre-tax compensation expense	$ 4	$ 4	$ (2)

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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