Summary of Revenues of Major Product Groups for Segments and Corporate and Other Activities (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,881	$ 2,041	$ 3,773	$ 4,026
Segment, Continuing Operations
Segment Reporting Information [Line Items]
Revenues	1,881	2,041	3,773	4,026
Segment, Continuing Operations | Enact
Segment Reporting Information [Line Items]
Revenues	273	276	543	564
Segment, Continuing Operations | Long-term Care Insurance
Segment Reporting Information [Line Items]
Revenues	1,119	1,226	2,228	2,366
Segment, Continuing Operations | Life Insurance
Segment Reporting Information [Line Items]
Revenues	310	329	649	677
Segment, Continuing Operations | Fixed Annuities
Segment Reporting Information [Line Items]
Revenues	92	122	208	254
Segment, Continuing Operations | U.S. Life Insurance
Segment Reporting Information [Line Items]
Revenues	1,521	1,677	3,085	3,297
Segment, Continuing Operations | Runoff
Segment Reporting Information [Line Items]
Revenues	70	88	136	164
Segment, Continuing Operations | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	$ 17	$ 0	$ 9	$ 1