Revenue and Contract Balances - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 506	$ 504	$ 975	$ 1,040
Residential
Disaggregation of Revenue [Line Items]
Total revenue	380	392	741	810
Rentals
Disaggregation of Revenue [Line Items]
Total revenue	91	71	165	132
Mortgages
Disaggregation of Revenue [Line Items]
Total revenue	24	29	50	75
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 11	$ 12	$ 19	$ 23