INCOME TAXES - Principal Components of Net Deferred Tax Balances (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Net operating loss carryforward	$ 105	$ 291
Compensation and other accrued expense	158	186
Benefits payable	103	67
Deferred acquisition costs	43	33
Jobs tax credits	22	33
Other	16	25
Unearned revenues	7	8
Investment securities	454	0
Total deferred income tax assets	908	643
Valuation allowance	(57)	(65)
Total deferred income tax assets, net of valuation allowance	851	578
Depreciable property and intangible assets	(740)	(1,072)
Prepaid expenses	(132)	(102)
Investment securities	0	(98)
Other	(6)	(4)
Total deferred income tax liabilities	(878)	(1,276)
Total net deferred income tax liabilities	$ (27)	$ (698)