Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Variable Interest Entity Nonconsolidated Carrying Amount Insurance Assets	$ 490	$ 2,195
Variable Interest Entity Nonconsolidated Carrying Amount Insurance Liabilities	840	1,023
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	21,639	25,112
Variable Interest Entity Nonconsolidated Carrying Amount Derivative Net Assets Or Liabilities	1
Fixed income securities, amortized cost	2,041
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	31	141
Variable Interest Entity [Member]
Variable Interest Entities [Line Items]
Variable Interest Entity Nonconsolidated Carrying Amount Derivative Net Assets Or Liabilities		5
Municipal Bonds [Member] | Variable Interest Entity [Member]
Variable Interest Entities [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	$ 1	$ 29