Deferred Acquisition Costs (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	$ 1,586
Ending balance	1,497	$ 1,586
Total deferred acquisition costs	1,497	1,586
Enact segment
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	22
Ending balance	22	22
Total deferred acquisition costs	22	22
Long-duration insurance contracts
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	1,564	1,755
Costs deferred	0	0
Amortization	(89)	(191)
Ending balance	1,475	1,564
Total deferred acquisition costs	1,475	1,564
Long- term care insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	769	823
Costs deferred	0	0
Amortization	(25)	(54)
Ending balance	744	769
Total deferred acquisition costs	744	769
Life insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	694	812
Costs deferred	0	0
Amortization	(55)	(118)
Ending balance	639	694
Total deferred acquisition costs	639	694
Fixed annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	30	37
Costs deferred	0	0
Amortization	(4)	(7)
Ending balance	26	30
Total deferred acquisition costs	26	30
Variable annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	71	83
Costs deferred	0	0
Amortization	(5)	(12)
Ending balance	66	71
Total deferred acquisition costs	$ 66	$ 71