Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Percentage of Total Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	wynn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Payment Default Classification Period For Interest Payment

+ References

No definition available.

+ Details

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Namespace Prefix:	wynn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=wynn_A5.25SeniorNotesDueMay152027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiaryIssuerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_DebtInstrumentAxis=wynn_FiveAndOneOverFourPercentageSeniorNotesDueMay152027Member
Namespace Prefix:
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Long-Term Debt - 5 1/4% Senior Notes, Due 2027 (Details) - Senior Notes - USD ($)	May 11, 2017	Dec. 31, 2019	Dec. 31, 2018
WLV \| 5 1/2% Senior Notes, Due May 15, 2027
Debt Instrument [Line Items]
Debt instrument, interest rate		5.25%
Subsidiary Issuer \| 5 1/2% Senior Notes, Due May 15, 2027
Debt Instrument [Line Items]
Debt covenant, percentage of total assets	15.00%
Subsidiary Issuer \| WLV \| 5 1/2% Senior Notes, Due May 15, 2027
Debt Instrument [Line Items]
Payment default classification period for interest payment	30 days
Principal amount purchased			$ 20,000,000.0
Subsidiary Issuer \| WLV \| 5 1/2% Senior Notes, Due May 15, 2027 \| Redemption period one
Debt Instrument [Line Items]
Debt redemption price as percentage of principal	100.00%
Subsidiary Issuer \| WLV \| 5 1/2% Senior Notes, Due May 15, 2027 \| Redemption period two
Debt Instrument [Line Items]
Debt redemption price as percentage of principal	100.00%
Subsidiary Issuer \| WLV \| 5 1/2% Senior Notes, Due May 15, 2027 \| Redemption period three
Debt Instrument [Line Items]
Debt redemption price as percentage of principal	101.00%
Subsidiary Issuer \| WLV \| WLV 5 1/4% Senior Notes, due 2027
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount	$ 900,000,000.0
Debt instrument, interest rate	5.25%