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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 07, 2020
Jun. 30, 2019
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-12675    
Entity Registrant Name KILROY REALTY CORPORATION    
Entity Central Index Key 0001025996    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
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    
Entity Shell Company false    
Entity Public Float     $ 7,416,459,726
Entity Common Stock, Shares Outstanding   106,167,149  
Documents Incorporated by Reference
Portions of the Kilroy Realty Corporation’s Proxy Statement with respect to its 2020 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.
    
Kilroy Realty L.P. [Member]      
Entity Information [Line Items]      
Entity File Number 000-54005    
Entity Registrant Name KILROY REALTY, L.P.    
Entity Central Index Key 0001493976    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
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    
Entity Shell Company false