Significant Accounting Policies (Details) $ in Millions		9 Months Ended
	Jul. 03, 2025 USD ($)	Sep. 30, 2025 USD ($) segment
Business Combination [Line Items]
Number of reportable segments | segment		3
Percentage of liabilities ceded		100.00%
Net proceeds from recapture and termination agreement		$ 39
Underwriting gain recognized from recapture and termination agreement		$ 14
Real Estate In McKinney, Texas
Business Combination [Line Items]
Acquisition consideration	$ 80
Real Estate In McKinney, Texas | Building
Business Combination [Line Items]
Estimated useful life	40 years