INVESTMENTS - Other Investments (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Other Investments	[1]	$ 2,016	$ 1,450
Commercial mortgage loans
Investment Holdings [Line Items]
Other Investments		1,052	855
Middle market loans
Investment Holdings [Line Items]
Other Investments		578	319
Short-term investments
Investment Holdings [Line Items]
Other Investments		138	89
Policy loans
Investment Holdings [Line Items]
Other Investments		201	184
Other investments
Investment Holdings [Line Items]
Other Investments		$ 47	$ 3

[1] Includes $1,200 in 2017 and $819 in 2016 of loan receivables from consolidated variable interest entities