INVESTMENTS - Other Investments (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Other Investments	[1]	$ 2,358	$ 1,450
Commercial mortgage loans
Investment Holdings [Line Items]
Other Investments		1,199	855
Middle market loans
Investment Holdings [Line Items]
Other Investments		798	319
Policy loans
Investment Holdings [Line Items]
Other Investments		207	184
Short-term investments
Investment Holdings [Line Items]
Other Investments		57	89
Other investments
Investment Holdings [Line Items]
Other Investments		$ 97	$ 3

[1] Includes $1,500 in 2017 and $819 in 2016 of loan receivables and limited partnerships from consolidated variable interest entities