Market Risk Benefits - Schedule of Balances of and Changes in Market Risk Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Market Risk Benefit [Roll Forward]
Beginning balance	$ 408
Ending balance	349	$ 408
Fixed indexed annuities
Market Risk Benefit [Roll Forward]
Beginning balance	48	55
Beginning balance before effect of changes in instrument-specific credit risk	45	52
Issuances	0	0
Interest accretion	2	3
Attributed fees collected	4	5
Benefit payments	0	0
Effect of changes in interest rates	5	(17)
Effect of changes in equity markets	(2)	(2)
Actual policyholder behavior different from expected behavior	(3)	(5)
Effect of changes in future expected policyholder behavior	0	13
Effect of changes in other future expected assumptions	(3)	0
Other	2	(4)
Ending balance before effect of changes in instrument-specific credit risk	50	45
Effect of changes in instrument-specific credit risk	2	3
Ending balance	52	48
Less: reinsurance recoverable	0	0
Market risk benefits, net of reinsurance recoverable	$ 52	$ 48
Weighted-average attained age of contractholders	75 years	73 years
Variable annuities
Market Risk Benefit [Roll Forward]
Beginning balance	$ 360	$ 527
Beginning balance before effect of changes in instrument-specific credit risk	356	520
Issuances	0	0
Interest accretion	16	25
Attributed fees collected	35	37
Benefit payments	(24)	(28)
Effect of changes in interest rates	35	(112)
Effect of changes in equity markets	(116)	(97)
Actual policyholder behavior different from expected behavior	(8)	5
Effect of changes in future expected policyholder behavior	0	6
Effect of changes in other future expected assumptions	0	0
Other	0	0
Ending balance before effect of changes in instrument-specific credit risk	294	356
Effect of changes in instrument-specific credit risk	3	4
Ending balance	297	360
Less: reinsurance recoverable	98	107
Market risk benefits, net of reinsurance recoverable	$ 199	$ 253
Weighted-average attained age of contractholders	77 years	76 years
Reinsurance recoverable
Market Risk Benefit [Roll Forward]
Beginning balance	$ 107	$ 140
Beginning balance before effect of changes in instrument-specific credit risk	107	140
Issuances	0	0
Interest accretion	5	7
Attributed fees collected	8	8
Benefit payments	(12)	(13)
Effect of changes in interest rates	4	(22)
Effect of changes in equity markets	(13)	(17)
Actual policyholder behavior different from expected behavior	(1)	4
Effect of changes in future expected policyholder behavior	0	0
Effect of changes in other future expected assumptions	0	0
Other	0	0
Ending balance before effect of changes in instrument-specific credit risk	98	107
Effect of changes in instrument-specific credit risk	0	0
Ending balance	$ 98	$ 107

GENWORTH FINANCIAL INC 10-K