SUBSEQUENT EVENTS (Details) - USD ($)	May 03, 2018	May 01, 2018	Mar. 31, 2018
P L I C O | Subsequent Event
Subsequent Event [Line Items]
Coinsurance basis percentage		100.00%
Ceded commissions for reinsurance		$ 422,900,000
Statutory reserves resulting from reinsurance, business acquired		$ 13,300,000,000
Amended Line Of Credit
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity			$ 1,000,000,000.0
Line of credit, maximum borrowing capacity to be granted upon entity's request			1,250,000,000.00
Line of Credit | Amended Line Of Credit
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity to be granted upon entity's request			$ 1,250,000,000.00
Line of Credit | Amended Line Of Credit | Subsequent Event
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity	$ 1,000,000,000
Credit facility term	5 years
Line of credit, maximum borrowing capacity to be granted upon entity's request	$ 1,500,000,000.0
Bridge Loan | Line of Credit | Amended Line Of Credit | Subsequent Event
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity	50,000,000
Letter of Credit | Line of Credit | Amended Line Of Credit | Subsequent Event
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity	$ 500,000,000