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Share Repurchase Authorizations - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | May 02, 2025 | May 01, 2025
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Equity [Abstract] |  |  |
Stock repurchase program, authorized amount |  | $ 3,500 | $ 2,500
Stock repurchase program, authorized additional amount |  | $ 1,000 |
Stock repurchase program, remaining authorized repurchase amount | $ 981 |  |

X
- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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