Subsidiary Debt - HomeServices (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Par value	$ 51,702
Subsidiary debt
Debt Instrument [Line Items]
Par value	37,501
Subsidiary debt	37,539	$ 36,659
HomeServices | Subsidiary debt
Debt Instrument [Line Items]
Par value	140
Subsidiary debt	$ 140	$ 148
HomeServices | Subsidiary debt | Variable-rate term loan (2021 - 0.950%, 2020 - 1.147%), due 2026
Debt Instrument [Line Items]
Stated rate	5.242%	0.95%
Par value	$ 140
Subsidiary debt	$ 140	$ 148