INVESTMENTS - Net Unrealized Investment (Details) - AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent - Unrealized Investment Gains Losses All Other - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net Unrealized Gains (Losses) on Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 128	$ 248
Net investment gains (losses) arising during the period	(222)	(138)
Included in net income (loss)	1
Excluded from net income (loss)		0
Other	0	(3)
Impact of net unrealized investment gains (losses)	0	0
Net unrealized investment gains (losses) excluding credit losses	(93)	107
Net unrealized investment gains (losses) with credit losses	0	0
Ending balance	(93)	107
DAC
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(46)	(111)
Impact of net unrealized investment gains (losses)	86	59
Net unrealized investment gains (losses) excluding credit losses	40	(52)
Ending balance	40	(52)
Policyholders’ Liabilities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	28	37
Impact of net unrealized investment gains (losses)	(54)	(11)
Net unrealized investment gains (losses) excluding credit losses	(26)	26
Ending balance	(26)	26
Deferred Income Tax Asset (Liability)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(24)	(38)
Impact of net unrealized investment gains (losses)	40	20
Net unrealized investment gains (losses) excluding credit losses	16	(18)
Ending balance	16	(18)
AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	86	136
Net investment gains (losses) arising during the period	(222)	(138)
Included in net income (loss)	1
Excluded from net income (loss)		0
Other	0	(3)
Impact of net unrealized investment gains (losses)	72	68
Net unrealized investment gains (losses) excluding credit losses	(63)	63
Net unrealized investment gains (losses) with credit losses	0	0
Ending balance	(63)	63
Fixed maturities | DAC
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net unrealized investment gains (losses) with credit losses	0	0
Fixed maturities | Policyholders’ Liabilities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net unrealized investment gains (losses) with credit losses	0	0
Fixed maturities | Deferred Income Tax Asset (Liability)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net unrealized investment gains (losses) with credit losses	$ 0	$ 0