EQUITY-BASED COMPENSATION - Information Related to Equity Awards other than Options (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RSUs and RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax expense for equity awards	$ 58	$ 57	$ 59
After-tax expense for equity awards	46	45	46
Fair value of vested equity awards	75	103	71
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax expense for equity awards	25	21	28
After-tax expense for equity awards	$ 20	$ 17	$ 22

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

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