Deferred Acquisition Costs - Schedule of Balances of And Changes in Deferred Acquisition Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	$ 1,779
Ending balance	1,586	$ 1,779
Total deferred acquisition costs	1,586	1,779
Enact segment
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	24
Ending balance	22	24
Total deferred acquisition costs	22	24
Long-duration insurance contracts
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	1,755	1,963
Costs deferred	0	0
Amortization	(191)	(208)
Ending balance	1,564	1,755
Total deferred acquisition costs	1,564	1,755
Long-Term Care Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	823	879
Costs deferred	0	0
Amortization	(54)	(56)
Ending balance	769	823
Total deferred acquisition costs	769	823
Life insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	812	941
Costs deferred	0	0
Amortization	(118)	(129)
Ending balance	694	812
Total deferred acquisition costs	694	812
Fixed annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	37	45
Costs deferred	0	0
Amortization	(7)	(8)
Ending balance	30	37
Total deferred acquisition costs	30	37
Variable annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	83	98
Costs deferred	0	0
Amortization	(12)	(15)
Ending balance	71	83
Total deferred acquisition costs	$ 71	$ 83