INVESTMENTS - Information Regarding Changes in Unrealized Gains and Losses from Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in unrealized gains (losses):
Changes in unrealized gains (losses)	$ 5,852	$ (3,142)	$ 1,728
Fixed maturity securities | Available-for-sale securities
Changes in unrealized gains (losses):
Changes in unrealized gains (losses)	5,852	(3,142)	1,657
Equity securities
Changes in unrealized gains (losses):
Changes in unrealized gains (losses)	$ 0	$ 0	$ 71