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	$ 287	$ 176
Level 3 Assets And Liabilities Held
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	(1)
Net Derivative Gains (Losses)	(9,386)	(2,937)
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	0
Net Derivative Gains (Losses)	0	0
OCI	0	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 Contract Asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	0
Net Derivative Gains (Losses)	2,818	740
OCI	0	0
Separate Account assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment gains (losses), net	0	(1)
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)	(12,204)	(3,677)
OCI	$ 0	$ 0