INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Beginning of year	$ 13,095	$ 17,177
End of year	9,483	12,268
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains Losses All Other | Net Unrealized Gains (Losses) on Investments
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Beginning of year	4,809	8,811
Net investment gains (losses) arising during the period	(6,425)	(5,129)
Included in net income (loss)	334	(175)
Other	0	(33)
Impact of net unrealized investment gains (losses)	0
Net unrealized investment gains (losses) excluding credit losses	(1,282)	3,474
Net unrealized investment gains (losses) with credit losses	(5)	(8)
End of year	(1,287)	3,466
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains Losses All Other | DAC
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Beginning of year	(782)	(1,548)
Impact of net unrealized investment gains (losses)	1,071	599
End of year	290	(947)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains Losses All Other | Policyholders’ Liabilities
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Beginning of year	(418)	(1,065)
Impact of net unrealized investment gains (losses)	182	757
End of year	(237)	(307)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains Losses All Other | Deferred Income Tax Asset (Liability)
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Beginning of year	(757)	(1,302)
Impact of net unrealized investment gains (losses)	1,015	836
End of year	259	(465)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains Losses All Other | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Beginning of year	2,852	4,896
Net investment gains (losses) arising during the period	(6,425)	(5,129)
Included in net income (loss)	334	(175)
Other	0	(33)
Impact of net unrealized investment gains (losses)	2,268	2,192
Net unrealized investment gains (losses) excluding credit losses	(971)	1,751
Net unrealized investment gains (losses) with credit losses	(4)	(4)
End of year	(975)	1,747
Fixed maturities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains Losses All Other | DAC
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses) excluding credit losses	289	(949)
Net unrealized investment gains (losses) with credit losses	1	2
Fixed maturities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains Losses All Other | Policyholders’ Liabilities
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses) excluding credit losses	(236)	(308)
Net unrealized investment gains (losses) with credit losses	(1)	1
Fixed maturities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains Losses All Other | Deferred Income Tax Asset (Liability)
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses) excluding credit losses	258	(466)
Net unrealized investment gains (losses) with credit losses	$ 1	$ 1