Deferred Acquisition Costs - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Deferred Policy Acquisition Costs [Line Items]
Accumulated effect of net unrealized investment (gains) losses	$ 27	$ (1,454)
Universal and term universal life insurance contracts | Unlocking
Deferred Policy Acquisition Costs [Line Items]
Deferred policy acquisition costs, impairment loss	39	38
Shadow accounting adjustment
Deferred Policy Acquisition Costs [Line Items]
Accumulated effect of net unrealized investment (gains) losses	$ 27	(1,454)
Shadow accounting adjustment | Long-term Care Insurance
Deferred Policy Acquisition Costs [Line Items]
Accumulated effect of net unrealized investment (gains) losses		$ (1,002)