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Share Repurchase Authorizations - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Jul. 31, 2023 | Jul. 30, 2023
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Equity [Abstract] |  |  |
Stock repurchase program, authorized amount |  | $ 2,500 | $ 1,800
Stock repurchase program, additional authorized amount |  | $ 750 |
Stock repurchase program, remaining authorized repurchase amount | $ 914 |  |

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Stock Repurchase Program, Additional Authorized Amount + References No definition available. + Details
Name: | z_StockRepurchaseProgramAdditionalAuthorizedAmount
Namespace Prefix: | z_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant