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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 18, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes Disclosure [Line Items]
Increase in effective income tax rate		3.00%
Effective income tax rate		24.00%	21.00%	20.00%
Valuation allowance related to tax credit carryforwards		$ 4	$ 4
Excess tax benefits		9	11	$ 11
Employment tax credit disallowed		6	7	5
Unrecognized tax benefits		8	7	$ 6	$ 6
State and Local Jurisdiction
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards		39	53
State tax credit carryforwards		6	$ 6
Federal
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards		2
Internal Revenue Service
Income Taxes Disclosure [Line Items]
Employment tax credit disallowed		11
Income tax examination, penalties and interest expense		4
Recovery of disallowed tax credits	$ 15
2019 Equity Incentive Plan
Income Taxes Disclosure [Line Items]
Excess tax benefits		$ 4

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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