SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Signficant Accounting Policies - Additional Information (Detail) $ in Millions		12 Months Ended
	Jan. 01, 2021 USD ($)	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Significant Accounting Policies [Line Items]
Number of reportable insurance business segments | segment		2
Goodwill		$ 265	$ 265
Stockholders' Equity Attributable to Parent		21,985	20,140	$ 17,031	$ 33,559
Accumulated other comprehensive income (loss)		(5,520)	(6,429)	(8,411)	8,934
Retained earnings		47,993	44,367
Amortized Cost		70,689	75,469
Held-to-maturity securities		(17,824)	(19,063)
Accounting Standards Update 2018-12
Significant Accounting Policies [Line Items]
Capped transition date NPR	100.00%
Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment
Significant Accounting Policies [Line Items]
Stockholders' Equity Attributable to Parent	$ (18,894)				(18,894)
Accumulated other comprehensive income (loss)	(18,600)				(18,570)
Retained earnings	(300)
Accumulated other comprehensive income (loss)
Significant Accounting Policies [Line Items]
Stockholders' Equity Attributable to Parent		(5,520)	(6,429)	(8,411)	8,934
Accumulated other comprehensive income (loss) | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment
Significant Accounting Policies [Line Items]
Stockholders' Equity Attributable to Parent	(18,570)				(18,570)
Retained earnings
Significant Accounting Policies [Line Items]
Stockholders' Equity Attributable to Parent		$ 47,993	$ 44,367	$ 40,963	37,984
Retained earnings | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment
Significant Accounting Policies [Line Items]
Stockholders' Equity Attributable to Parent	$ (324)				$ (324)