Insurance Company Subsidiary Operations - Effects of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Written
Net premiums		$ 80
Earned
Net premiums		36
WNFIC
Written
Direct premiums		516
Ceded premiums		(516)
Earned
Direct premiums		507
Ceded premiums		(507)
Quota Share Captive and Excess of Loss Layer Captive
Written
Assumed Premiums		114
Net premiums		80
Earned
Assumed Premium		70
Net premiums		36
Quota Share Captive
Written
Ceded premiums		(34)
Net premiums	$ 79
Earned
Ceded premiums		$ (34)
Net premiums	$ 36