INVESTMENTS - PREDECESSOR COMPANY - Allowance for Credit Losses for Fixed Maturity Securities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of year	$ 1
Additions to allowance for credit losses not previously recorded	3
Reductions for securities sold during the year	(2)
Addition (reductions) on securities with previous allowance	(1)
Balance, end of year	1
U.S Treasury securities and obligations of U.S. government authorities and agencies
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of year	0
Additions to allowance for credit losses not previously recorded	0
Reductions for securities sold during the year	0
Addition (reductions) on securities with previous allowance	0
Balance, end of year	0
Foreign government bonds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of year	0
Additions to allowance for credit losses not previously recorded	0
Reductions for securities sold during the year	0
Addition (reductions) on securities with previous allowance	0
Balance, end of year	0
U.S. and Foreign Corporate Securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of year	1
Additions to allowance for credit losses not previously recorded	3
Reductions for securities sold during the year	(2)
Addition (reductions) on securities with previous allowance	(1)
Balance, end of year	1
Asset-Backed Securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of year	0
Additions to allowance for credit losses not previously recorded	0
Reductions for securities sold during the year	0
Addition (reductions) on securities with previous allowance	0
Balance, end of year	0
Commercial mortgage loans
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of year	0
Additions to allowance for credit losses not previously recorded	0
Reductions for securities sold during the year	0
Addition (reductions) on securities with previous allowance	0
Balance, end of year	0
Residential mortgage-backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of year	0
Additions to allowance for credit losses not previously recorded	0
Reductions for securities sold during the year	0
Addition (reductions) on securities with previous allowance	0
Balance, end of year	$ 0