Subsidiary Debt - HomeServices (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Par value	$ 55,471
Subsidiary debt
Debt Instrument [Line Items]
Par value	42,270
Subsidiary debt	42,150	$ 38,971
HomeServices | Subsidiary debt
Debt Instrument [Line Items]
Par value	60
Subsidiary debt	$ 60	$ 133
HomeServices | Subsidiary debt | Variable-rate term loan (2024 - 6.27%, 2023 - 6.27%), due 2026
Debt Instrument [Line Items]
Stated rate	7.41%	6.27%
Par value	$ 60
Subsidiary debt	$ 60	$ 133