Acquisition (Summary of Consideration Paid and Identified Assets and Liabilities Assumed at Acquisition Date) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 19, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Goodwill	$ 967		$ 503
2-10 HBW Acquisition [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 24
Marketable securities		15
Receivables		4
Prepaid expenses and other current assets		8
Property and equipment, net		6
Goodwill	$ 464	464
Intangible assets		309
Long-term marketable securities		39
Deferred reinsurance		66
Reinsurance recoverables		9
Accounts payable		(1)
Accrued liabilities:
Payroll and related expenses		(8)
Home warranty claims		(7)
Other		(6)
Deferred revenue		(29)
Deferred tax liabilities, net		(25)
Unearned insurance premium		(234)
Unpaid losses and loss adjustment reserves		(12)
Long-term deferred revenue		(12)
Other long-term liabilities		(1)
Total consideration paid		$ 607