FAIR VALUE DISCLOSURES - UNREALIZED GAINS (LOSSES) FOR LEVEL 3 STILL HELD (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	$ (5)	$ 10	$ 82	$ (1)
Level 3 | Corporate
Change in Accounting Estimate [Line Items]
Net Derivative Gains (losses)	0	0	0	0
OCI	6	(51)	(14)	(6)
Level 3 | States and political subdivisions
Change in Accounting Estimate [Line Items]
Net Derivative Gains (losses)	0	0	0	0
OCI	0	0	(1)	0
Level 3 | Commercial mortgage-backed
Change in Accounting Estimate [Line Items]
Net Derivative Gains (losses)	0	(9)	0	(20)
OCI	0	7	0	19
Level 3 | Asset-backed
Change in Accounting Estimate [Line Items]
Net Derivative Gains (losses)	0	15	0	15
OCI	(1)	(11)	(1)	(7)
Level 3 | GMIB reinsurance contracts
Change in Accounting Estimate [Line Items]
Net Derivative Gains (losses)	0	0	0	0
OCI	0	0	0	0
Level 3 | Separate Account assets
Change in Accounting Estimate [Line Items]
Net Derivative Gains (losses)	7	8	14	0
OCI	0	0	$ 0	$ 0
Level 3 | Assets and Liabilities Still Held | Corporate
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0
Net Derivative Gains (losses)	0	0
OCI	(7)	(45)
Level 3 | Assets and Liabilities Still Held | States and political subdivisions
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0
Net Derivative Gains (losses)	0
OCI	(1)
Level 3 | Assets and Liabilities Still Held | Commercial mortgage-backed
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0
Net Derivative Gains (losses)	0	0
OCI	0	5
Level 3 | Assets and Liabilities Still Held | Asset-backed
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0
Net Derivative Gains (losses)	0	0
OCI	(1)	(11)
Level 3 | Assets and Liabilities Still Held | Subtotal
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0
Net Derivative Gains (losses)	0	0
OCI	(9)	(51)
Level 3 | Assets and Liabilities Still Held | GMIB reinsurance contracts
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0
Net Derivative Gains (losses)	(1,224)	893
OCI	0	0
Level 3 | Assets and Liabilities Still Held | Separate Account assets
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	14	18
Net Derivative Gains (losses)	0	0
OCI	0	0
Level 3 | Assets and Liabilities Still Held | GMxB derivative features’ liability
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0
Net Derivative Gains (losses)	847	721
OCI	0	0
Level 3 | Assets and Liabilities Still Held | Total
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	14	18
Net Derivative Gains (losses)	(377)	1,614
OCI	$ (9)	$ (51)