INVESTMENTS - Net Unrealized Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]
Beginning of year	$ 21,640	$ 14,682	$ 15,126	$ 15,432
Deferred income taxes	(428)	(362)	(810)	(580)
End of year	19,134	16,388	19,134	16,388
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	5,306	1,187	3,453	(522)
Net investment gains (losses) arising during the period	3,614	1,746	5,536	3,456
Included in Net income (loss)	(190)	(4)	(252)	(5)
Excluded from Net earnings (loss)	0	0	0	0
Net unrealized investment gains (losses) excluding OTTI losses	8,730	2,929	8,737	2,929
Net unrealized investment gains (losses) with OTTI losses	(2)	2	(9)	2
End of year	8,728	2,931	8,728	2,931
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	(921)	(601)	(899)	100
DAC	(600)	49	(624)	(652)
Net unrealized investment gains (losses) excluding OTTI losses	(1,521)	(552)	(1,523)	(552)
End of year	(1,521)	(552)	(1,521)	(552)
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	(354)	12	(189)	(73)
Policyholders liabilities	(681)	(100)	(846)	(15)
Net unrealized investment gains (losses) excluding OTTI losses	(1,035)	(88)	(1,035)	(88)
End of year	(1,034)	(88)	(1,034)	(88)
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	(847)	(126)	(497)	104
Deferred income taxes	(450)	(355)	(801)	(585)
Net unrealized investment gains (losses) excluding OTTI losses	(1,297)	(481)	(1,298)	(481)
End of year	(1,297)	(481)	(1,297)	(481)
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	3,184	472	1,868	(391)
Net investment gains (losses) arising during the period	3,614	1,746	5,536	3,456
Included in Net income (loss)	(190)	(4)	(252)	(5)
Excluded from Net earnings (loss)	0	0	0	0
DAC	(600)	49	(624)	(652)
Deferred income taxes	(450)	(355)	(801)	(585)
Policyholders liabilities	(681)	(100)	(846)	(15)
Net unrealized investment gains (losses) excluding OTTI losses	4,877	1,808	4,881	1,808
Net unrealized investment gains (losses) with OTTI losses	(1)	2	(5)	2
End of year	4,876	1,810	4,876	1,810
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) with OTTI losses	0	0	2	0
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) with OTTI losses	1	0	1	0
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) with OTTI losses	$ 0	$ 0	$ 1	$ 0