Net Unrealized Gains and Losses on Available-for-Sale Investment Securities Reflected as Separate Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions		Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Components of Net Unrealized Investment Gains Losses Included in Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gains (losses) on fixed maturity securities without an allowance for credit losses	[1]	$ (1,961)		$ 7,869
Net unrealized gains (losses) on fixed maturity securities with an allowance for credit losses	[1]	0		0
Adjustments to DAC, present value of future profits, sales inducements, benefit reserves and policyholder contract balances		(17)		(5,487)
Income taxes, net		370		(507)
Net unrealized investment gains (losses)		(1,608)		1,875
Less: net unrealized investment gains (losses) attributable to noncontrolling interests		(54)		15
Net unrealized investment gains (losses)		$ (1,554)	$ 850	$ 1,860	$ 1,865	$ 1,919	$ 2,214

[1] Excludes foreign exchange.