DAC AND POLICYHOLDER BONUS INTEREST CREDITS - Rollforward of DAC Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 5,011	$ 4,492	$ 5,025
Capitalization of commissions, sales and issue expenses	648	597	578
Amortization:
Impact of assumptions updates and model changes	77	165	(247)
All other	(529)	(596)	(653)
Amortization	(452)	(431)	(900)
Change in unrealized investment gains (losses)	(870)	353	(211)
Balance, End of Year	$ 4,337	$ 5,011	$ 4,492