INVESTMENTS - Net Unrealized Investment (Details) - Unrealized gains (losses) on investments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Unrealized Investment Gains Losses All Other | Net Unrealized Gains (Losses) on Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ (159)	$ (388)
Net investment gains (losses) arising during the period	(85)	71
Included in net income (loss)	0	5
Other	0	0
Impact of net unrealized investment gains (losses)	0	0
Ending balance	(244)	(312)
Unrealized Investment Gains Losses All Other | Policyholders’ Liabilities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	8	8
Net investment gains (losses) arising during the period	0	0
Included in net income (loss)	0	0
Other	0	0
Impact of net unrealized investment gains (losses)	1	(2)
Ending balance	9	6
Unrealized Investment Gains Losses All Other | Deferred Income Tax Asset (Liability)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(33)	(1)
Net investment gains (losses) arising during the period	0	0
Included in net income (loss)	0	0
Other	(4)	16
Impact of net unrealized investment gains (losses)	18	(16)
Ending balance	(19)	(1)
Unrealized Investment Gains Losses All Other | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(184)	(381)
Net investment gains (losses) arising during the period	(85)	71
Included in net income (loss)	0	5
Other	(4)	16
Impact of net unrealized investment gains (losses)	19	(18)
Ending balance	(254)	(307)
Net unrealized investment gains (losses) excluding credit losses | Net Unrealized Gains (Losses) on Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	(244)	(312)
Net unrealized investment gains (losses) excluding credit losses | Policyholders’ Liabilities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	9	6
Net unrealized investment gains (losses) excluding credit losses | Deferred Income Tax Asset (Liability)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	(19)	(1)
Net unrealized investment gains (losses) excluding credit losses | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	$ (254)	$ (307)