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Revenue and Contract Balances - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 496	$ 483	$ 1,471	$ 1,523
Residential
Disaggregation of Revenue [Line Items]
Total revenue	362	372	1,103	1,182
Rentals
Disaggregation of Revenue [Line Items]
Total revenue	99	74	264	206
Mortgages
Disaggregation of Revenue [Line Items]
Total revenue	24	26	74	101
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 11	$ 11	$ 30	$ 34

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