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Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes, Unsecured Revolving Credit Facility and Term Loan Facility (Details) - Kilroy Realty L.P.
 12 Months Ended
Dec. 31, 2023
USD ($)
extension_option
Dec. 31, 2022
USD ($)
extension_option
Oct. 31, 2022
USD ($)
Revolving credit facility      
Terms of the Credit Facility      
Outstanding borrowings $ 0 $ 0  
Remaining borrowing capacity 1,100,000,000 1,100,000,000  
Total borrowing capacity $ 1,100,000,000 $ 1,100,000,000  
Interest rate 6.38% 5.20%  
Facility fee-annual rate (percent) 0.20% 0.20%  
Outstanding letters of credit $ 5,200,000    
Contingent additional borrowings $ 500,000,000 $ 500,000,000  
Debt instrument, reduction interest rate 0.01% 0.01%  
Unamortized debt issuance expense $ 3,200,000 $ 5,300,000  
Number of extension options | extension_option 2 2  
Extension period (in months) 6 months 6 months  
Revolving credit facility | Secured Overnight Financing Rate (SOFR)      
Terms of the Credit Facility      
Basis spread on SOFR and LIBOR 0.90% 0.90%  
Term loan facility | Unsecured Term Loan Facility      
Terms of the Credit Facility      
Outstanding borrowings $ 520,000,000 $ 200,000,000  
Remaining borrowing capacity 0 200,000,000  
Total borrowing capacity $ 520,000,000 $ 400,000,000  
Interest rate 6.41% 5.23%  
Undrawn facility fee-annual rate 0.20% 0.20%  
Contingent additional borrowings $ 130,000,000 $ 100,000,000 $ 100,000,000
Unamortized debt issuance expense $ 2,300,000 $ 4,500,000  
Term loan facility | Unsecured Term Loan Facility | Secured Overnight Financing Rate (SOFR)      
Terms of the Credit Facility      
Basis spread on SOFR and LIBOR 0.95% 0.95%  
Revolving Credit Facility and Term Loan Facility | Adjusted SOFR      
Terms of the Credit Facility      
Basis spread on SOFR and LIBOR 0.10% 0.10%