INVESTMENTS - Other Investments (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Other investments		$ 3,612	$ 2,429
Policy loans
Investment Holdings [Line Items]
Other investments		241	260
Short-term investments
Investment Holdings [Line Items]
Other investments	[1]	1,833	1,139
Limited partnerships
Investment Holdings [Line Items]
Other investments		1,519	1,004
Other
Investment Holdings [Line Items]
Other investments		$ 19	$ 26

[1] Includes securities lending collateral