Deferred Acquisition Costs - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Deferred Policy Acquisition Costs [Line Items]
Accumulated effect of net unrealized investment (gains) losses	$ 36	$ (1,375)
Universal and term universal life insurance contracts | Unlocking
Deferred Policy Acquisition Costs [Line Items]
Deferred policy acquisition costs, impairment loss	52	76
Shadow accounting adjustment
Deferred Policy Acquisition Costs [Line Items]
Accumulated effect of net unrealized investment (gains) losses	$ 36	$ (1,375)