Long-Term Debt Long-Term Debt - Cross Claim and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Fair value of debt instrument excluding the Redemption Note	$ 8,970	$ 7,950
Long-term debt excluding the Redemption Note	$ 9,540	$ 7,850

Debt Instrument, Fair Value, Excluding The Redemption Note

No definition available.

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