Change in Net Unrealized Gains (Losses) on Available-for-Sale Securities Reported in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments [Abstract]
Beginning balance	$ (3,056)	$ (1,518)	$ (3,407)	$ 6,077
Unrealized gains (losses) on fixed maturity securities	(2,102)	(3,098)	(1,687)	(12,941)
Adjustments to policyholder contract balances	42	52	36	212
Provision for income taxes	319	508	232	2,517
Change in unrealized gains (losses) on investment securities	(1,741)	(2,538)	(1,419)	(10,212)
Reclassification adjustments to net investment (gains) losses, net of taxes of $(2), $(6), $(12) and $(8)	9	21	45	31
Change in net unrealized investment gains (losses)	(1,732)	(2,517)	(1,374)	(10,181)
Less: change in net unrealized investment gains (losses) attributable to noncontrolling interests	(10)	(25)	(3)	(94)
Ending balance	$ (4,778)	$ (4,010)	$ (4,778)	$ (4,010)