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Long-Term Debt - Cross Claim and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Debt Disclosure [Abstract] |  |
Fair value of debt instrument excluding the Redemption Note | $ 13,350 | $ 10,800
Long-term debt excluding the Redemption Note | $ 13,150 | $ 10,520

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

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- Definition Debt Instrument, Fair Value, Excluding The Redemption Note + References No definition available. + Details
Name: | wynn_DebtInstrumentFairValueExcludingTheRedemptionNote
Namespace Prefix: | wynn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Long Term Debt Excluding Redemption Note + References No definition available. + Details
Name: | wynn_LongTermDebtExcludingRedemptionNote
Namespace Prefix: | wynn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant