FAIR VALUE DISCLOSURES - Unrealized Gains (Losses) for Level 3 Still Held (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	$ (12)	$ (5)	$ (20)	$ 82
Corporate
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net			0	0
Net Derivative Gains (Losses)			0	0
OCI			10	(7)
States and political subdivisions
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net			0	0
Net Derivative Gains (Losses)			0	0
OCI			2	(1)
Asset-backed
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net			0	0
Net Derivative Gains (Losses)			0	0
OCI			5	(1)
Subtotal
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net			0	0
Net Derivative Gains (Losses)			0	0
OCI			17	(9)
GMIB reinsurance contracts
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net			0	0
Net Derivative Gains (Losses)			217	(1,233)
OCI			0	0
Separate Accounts Assets
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net			5	14
Net Derivative Gains (Losses)			0	0
OCI			0	0
GMxB derivative features liability
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net			0	0
Net Derivative Gains (Losses)			(1,116)	928
OCI			0	0
Total
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net			5	14
Net Derivative Gains (Losses)			(899)	(305)
OCI			17	(9)
Level 3 \| Corporate
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0	0	0
OCI	1	6	10	(14)
Level 3 \| States and political subdivisions
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0	0	0
OCI	1	0	2	(1)
Level 3 \| Asset-backed
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0	0	0
OCI	1	(1)	5	(1)
Level 3 \| GMIB reinsurance contracts
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	0	0	0	0
OCI	0	0	0	0
Level 3 \| Separate Accounts Assets
Change in Accounting Estimate [Line Items]
Investment Gains (Losses), Net	5	7	12	14
OCI	$ 0	$ 0	$ 0	$ 0

This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in net investment gains (losses); the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of realized and unrealized gain (loss) on investment.

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