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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 02, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-12675    
Entity Registrant Name KILROY REALTY CORPORATION    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 95-4598246    
Entity Address, Address Line One 12200 W. Olympic Boulevard    
Entity Address, Address Line Two Suite 200    
Entity Address, City or Town Los Angeles    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90064    
City Area Code (310)    
Local Phone Number 481-8400    
Title of 12(b) Security Common Stock, $.01 par value    
Security Exchange Name NYSE    
Trading Symbol KRC    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 3,505,253,788
Entity Common Stock, Shares Outstanding   117,326,410  
Documents Incorporated by Reference
Portions of the Kilroy Realty Corporation’s Proxy Statement with respect to its 2024 Annual Meeting of Stockholders to be filed not later than 120 days after the end of the registrant’s fiscal year are incorporated by reference into Part III of this Form 10-K.
    
Entity Central Index Key 0001025996    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Kilroy Realty L.P.      
Entity Information [Line Items]      
Current Fiscal Year End Date --12-31    
Entity File Number 000-54005    
Entity Registrant Name KILROY REALTY, L.P.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-4612685    
Title of 12(g) Security Common Units Representing Limited Partnership Interests    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Central Index Key 0001493976    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false