INCOME TAXES - Principal Components of Net Deferred Tax Balances (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Net operating loss carryforward	$ 291	$ 32
Compensation and other accrued expense	186	171
Benefits payable	67	87
Deferred acquisition costs	33	26
Jobs tax credits	33	0
Other	25	11
Unearned revenues	8	12
Total deferred income tax assets	643	339
Valuation allowance	(65)	(37)
Total deferred income tax assets, net of valuation allowance	578	302
Depreciable property and intangible assets	(1,072)	(449)
Prepaid expenses	(102)	(91)
Investment securities	(98)	(418)
Future policy benefits payable	(4)	(3)
Total deferred income tax liabilities	(1,276)	(961)
Total net deferred income tax liabilities	$ (698)	$ (659)