INCOME TAXES - U.S. Federal Statutory Income Tax Rate Reconciled to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Pre-Tax Income	$ 441	$ 357	$ 270
Tax Expense/(Benefit)
U.S. federal statutory tax rate	93	75	57
State income taxes, net of federal benefit	32	25	20
Tax rate change	(1)	0	0
Nondeductible meals, entertainment and penalties	2	0	1
Stock based compensation	(2)	(2)	(1)
Uncertain tax positions	(1)	1	0
Tax credits	(7)	(6)	(7)
State and tax return to provision adjustments	(10)	(7)	(8)
Other	(3)	(1)	(4)
Total	$ 103	$ 85	$ 58
Percent of Pre-Tax Income (Loss)
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	7.00%	7.00%	7.00%
Tax rate change	0.00%	0.00%	0.00%
Nondeductible meals, entertainment and penalties	0.00%	0.00%	0.00%
Stock based compensation	0.00%	0.00%	0.00%
Uncertain tax positions	0.00%	0.00%	0.00%
Tax credits	(2.00%)	(2.00%)	(3.00%)
State and tax return to provision adjustments	(2.00%)	(2.00%)	(3.00%)
Other	(1.00%)	0.00%	(1.00%)
Total	23.00%	24.00%	21.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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