Restructuring and Zillow Offers Wind Down - Charges Incurred and Expected (Details) - Disposal Group, Disposed of By Means Other Than Sale, Wind-Down - Zillow Offers Operations $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 491,206
Inventory write-down
Restructuring Cost and Reserve [Line Items]
Restructuring charges	407,921
Total other charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	83,285
Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	60,840
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	9,960
Financing-related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,227
Accelerated depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,885
Asset write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,373
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	175,000
Minimum | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	99,000
Minimum | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	11,000
Minimum | Financing-related charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	40,000
Minimum | Accelerated depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	24,000
Minimum | Asset write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	1,000
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	205,000
Maximum | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	112,000
Maximum | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	18,000
Maximum | Financing-related charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	48,000
Maximum | Accelerated depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	25,000
Maximum | Asset write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	2,000
Homes
Restructuring Cost and Reserve [Line Items]
Restructuring charges	490,280
Homes | Inventory write-down
Restructuring Cost and Reserve [Line Items]
Restructuring charges	407,921
Homes | Total other charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	82,359
Homes | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	59,914
Homes | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	9,960
Homes | Financing-related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,227
Homes | Accelerated depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,885
Homes | Asset write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,373
Mortgages
Restructuring Cost and Reserve [Line Items]
Restructuring charges	926
Mortgages | Inventory write-down
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Mortgages | Total other charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	926
Mortgages | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	926
Mortgages | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Mortgages | Financing-related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Mortgages | Accelerated depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Mortgages | Asset write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0