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Share-Based Awards - Additional Information (Detail) $ / shares in Units, $ in Millions				12 Months Ended
	Aug. 03, 2022 USD ($) employee $ / shares shares	Jun. 09, 2020 shares	Aug. 08, 2019 shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares) | shares		12,000,000
Unrecognized compensation cost expected recognition period				2 years 6 months
Zillow Group, Inc. 2020 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares of common and capital stock available for issuance, percentage		5.00%
Exercise price per share fixed		100.00%
2019 Equity Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares) | shares			10,000,000
Exercise price per share fixed			100.00%
Option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, exercise price (USD per share) | $ / shares	$ 38.78
Share-based compensation arrangement by share-based payment award, options, plan modification, grants in period, weighted average grant date fair value (USD per share) | $ / shares	$ 67.58
Share-based payment arrangement, plan modification, number of awards impacted | shares	7,000,000
Share-based payment arrangement, plan modification, number of grantees affected | employee	3,348
Share-based payment arrangement, plan modification, expected incremental cost	$ 66
Share-based payment arrangement, plan modification, incremental cost	$ 33
Unrecognized cost of unvested share-based compensation awards				$ 409
Total intrinsic value of shares				13	$ 310	$ 564
Fair value of options				$ 226	173	85
Option awards | Zillow Group, Inc. 2020 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment, award maximum exercisable period				12 months
Expiration period				10 years
Vesting period				4 years
Option awards | 2019 Equity Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment, award maximum exercisable period				12 months
Expiration period				10 years
Share based compensation arrangement by share based payment, award minimum exercisable period				3 months
Vesting percentage				25.00%
Option awards | 2019 Equity Inducement Plan | Vesting, Option One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				12 months
Option awards | 2019 Equity Inducement Plan | Vesting, Option Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost expected recognition period				2 years 6 months
Total fair value of awards vested				$ 247	$ 152	$ 125
Total unrecognized compensation cost				$ 470
Unvested restricted stock units | Zillow Group, Inc. 2020 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Unvested restricted stock units | 2019 Equity Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				25.00%
Unvested restricted stock units | 2019 Equity Inducement Plan | Vesting, Option One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				12 months
Unvested restricted stock units | 2019 Equity Inducement Plan | Vesting, Option Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years

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