FAIR VALUE DISCLOSURES - Unrealized Gains (Losses) For Level 3 Instruments (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	$ 262	$ 181
Level 3 Assets And Liabilities Held
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	(14)
Net Derivative Gains (Losses)	(2,533)	(2,775)
OCI	(35)	10
Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	0
Net Derivative Gains (Losses)	0	0
OCI	(37)	3
States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	0
Net Derivative Gains (Losses)	0	0
OCI	2	3
Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net		0
Net Derivative Gains (Losses)		0
OCI		4
Fixed maturities, AFS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	0
Net Derivative Gains (Losses)	0	0
OCI	(35)	10
GMIB reinsurance contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	0
Net Derivative Gains (Losses)	849	881
OCI	0	0
Separate account assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net		(14)
Net Derivative Gains (Losses)		0
OCI		0
GMxB derivative features liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	0
Net Derivative Gains (Losses)	(3,382)	(3,656)
OCI	$ 0	$ 0