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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
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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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

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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

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No definition available.

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Name:	wynn_LongTermDebtExcludingRedemptionNote
Namespace Prefix:	wynn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant