INSURANCE LIABILITIES - Textual (Details) $ in Millions	Mar. 31, 2018 USD ($)
GMDB
Net Amount at Risk by Product and Guarantee [Line Items]
Account value hedged of variable annuity contracts	$ 54,391
Net amount at risk hedged of variable annuity contracts	7,600
GMIB
Net Amount at Risk by Product and Guarantee [Line Items]
Account value hedged of variable annuity contracts	41,189
Net amount at risk hedged of variable annuity contracts	$ 3,057
Non Affiliated Entity | GMDB
Net Amount at Risk by Product and Guarantee [Line Items]
Amount reinsured with non-affiliates and affiliates	3.40%
Non Affiliated Entity | GMIB
Net Amount at Risk by Product and Guarantee [Line Items]
Amount reinsured with non-affiliates and affiliates	16.60%
Affiliates | GMDB
Net Amount at Risk by Product and Guarantee [Line Items]
Amount reinsured with non-affiliates and affiliates	50.80%
Affiliates | GMIB
Net Amount at Risk by Product and Guarantee [Line Items]
Amount reinsured with non-affiliates and affiliates	58.00%