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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 18, 2022
Jun. 30, 2021
Document Information [Line Items]      
Entity Central Index Key 0000906553    
Entity Registrant Name BOYD GAMING CORP    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 1-12882    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 88-0242733    
Entity Address, Address Line One 6465 South Rainbow Boulevard    
Entity Address, City or Town Las Vegas    
Entity Address, State or Province NV    
Entity Address, Postal Zip Code 89118    
City Area Code 702    
Local Phone Number 792-7200    
Title of 12(b) Security Common Stock, par value of $0.01 per share    
Trading Symbol BYD    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 5,000,000,000.0
Entity Common Stock, Shares Outstanding   110,006,004  
Auditor Name Deloitte & Touche LLP    
Auditor Location Las Vegas, Nevada    
Auditor Firm ID 34    
ICFR Auditor Attestation Flag true