FAIR VALUE DISCLOSURES - Unrealized Gains (Losses) for Level 3 Instruments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Level 3 Assets And Liabilities Held
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Gains (Losses)	$ (3,155)	$ (949)
OCI	(52)	18
Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Gains (Losses)	0	0
OCI	(54)	10
States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Gains (Losses)	0	0
OCI	2	3
Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Gains (Losses)	0	0
OCI	0	5
Fixed maturities, AFS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Gains (Losses)	0	0
OCI	(52)	18
GMIB Reinsurance Contract Asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Gains (Losses)	839	177
OCI	0	0
GMxB derivative features liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Gains (Losses)	(3,994)	(1,126)
OCI	$ 0	$ 0