INVESTMENTS - Other Investments (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Other investments		$ 1,238	$ 787
Policy loans
Investment Holdings [Line Items]
Other investments		236	232
Short-term investments
Investment Holdings [Line Items]
Other investments	[1]	543	152
Limited partnerships
Investment Holdings [Line Items]
Other investments		434	377
Other
Investment Holdings [Line Items]
Other investments		$ 25	$ 26

[1] Includes securities lending collateral