REINUSRANCE - SUCCESSOR COMPANY - Additional Information (Details) $ in Millions	9 Months Ended
	Dec. 31, 2022 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Net modified coinsurance payable	$ 4,635
Contracts novated	$ 6,700
Contracts novated, since acquisition	66.00%
Net modified coinsurance receivable | Registered Index-linked Annuities
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Net modified coinsurance payable	$ 1,745