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Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes (Details) - USD ($)
Dec. 31, 2024
Jan. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]      
Total Unsecured Senior Notes, Net $ 3,999,566,000   $ 4,325,153,000
Unsecured debt | Unsecured Senior Notes      
Debt Instrument [Line Items]      
Unamortized discount (premium), net 8,400,000   5,300,000
Unamortized debt issuance expense 15,800,000   15,900,000
Kilroy Realty L.P.      
Debt Instrument [Line Items]      
Long-term debt, gross 4,631,688,000    
Total Unsecured Senior Notes, Net 3,999,566,000   4,325,153,000
Kilroy Realty L.P. | Unsecured debt      
Debt Instrument [Line Items]      
Total Unsecured Senior Notes, Net $ 3,800,795,000   3,807,495,000
Kilroy Realty L.P. | Unsecured debt | 4.300% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 4.30%    
Effective interest rate 4.30%    
Long-term debt, gross $ 50,000,000   50,000,000
Unamortized discount and deferred financing costs (69,000)   (113,000)
Total Unsecured Senior Notes, Net $ 49,931,000   49,887,000
Kilroy Realty L.P. | Unsecured debt | 4.350% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 4.35%    
Effective interest rate 4.35%    
Long-term debt, gross $ 200,000,000   200,000,000
Unamortized discount and deferred financing costs (314,000)   (488,000)
Total Unsecured Senior Notes, Net $ 199,686,000   199,512,000
Kilroy Realty L.P. | Unsecured debt | 3.350% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 3.35%    
Effective interest rate 3.35%    
Long-term debt, gross $ 175,000,000   175,000,000
Unamortized discount and deferred financing costs (247,000)   (363,000)
Total Unsecured Senior Notes, Net $ 174,753,000   174,637,000
Kilroy Realty L.P. | Unsecured debt | 3.450% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 3.45%    
Effective interest rate 3.45%    
Long-term debt, gross $ 75,000,000   75,000,000
Unamortized discount and deferred financing costs (176,000)   (219,000)
Total Unsecured Senior Notes, Net $ 74,824,000   74,781,000
Kilroy Realty L.P. | Unsecured debt | 4.270% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 4.27%    
Effective interest rate 4.27%    
Long-term debt, gross $ 350,000,000   350,000,000
Unamortized discount and deferred financing costs (1,101,000)   (1,282,000)
Total Unsecured Senior Notes, Net $ 348,899,000   $ 348,718,000
Kilroy Realty L.P. | Unsecured debt | 3.450% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate     3.45%
Effective interest rate 3.47%    
Long-term debt, gross $ 0   $ 403,712,000
Unamortized discount and deferred financing costs 0   (558,000)
Total Unsecured Senior Notes, Net $ 0   403,154,000
Kilroy Realty L.P. | Unsecured debt | 4.375% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 4.375%    
Effective interest rate 4.444%    
Long-term debt, gross $ 400,000,000   400,000,000
Unamortized discount and deferred financing costs (415,000)   (969,000)
Total Unsecured Senior Notes, Net $ 399,585,000   399,031,000
Kilroy Realty L.P. | Unsecured debt | 4.750% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 4.75%    
Effective interest rate 4.80%    
Long-term debt, gross $ 400,000,000   400,000,000
Unamortized discount and deferred financing costs (1,973,000)   (2,468,000)
Total Unsecured Senior Notes, Net $ 398,027,000   397,532,000
Kilroy Realty L.P. | Unsecured debt | 4.250% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 4.25%    
Effective interest rate 4.35%    
Long-term debt, gross $ 400,000,000   400,000,000
Unamortized discount and deferred financing costs (2,439,000)   (2,971,000)
Total Unsecured Senior Notes, Net $ 397,561,000   397,029,000
Kilroy Realty L.P. | Unsecured debt | 3.050% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 3.05%    
Effective interest rate 3.064%    
Long-term debt, gross $ 500,000,000   500,000,000
Unamortized discount and deferred financing costs (3,036,000)   (3,629,000)
Total Unsecured Senior Notes, Net $ 496,964,000   496,371,000
Kilroy Realty L.P. | Unsecured debt | 2.500% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 2.50%    
Effective interest rate 2.56%    
Long-term debt, gross $ 425,000,000   425,000,000
Unamortized discount and deferred financing costs (4,201,000)   (4,735,000)
Total Unsecured Senior Notes, Net $ 420,799,000   420,265,000
Kilroy Realty L.P. | Unsecured debt | 2.650% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Stated coupon rate 2.65%    
Effective interest rate 2.654%    
Long-term debt, gross $ 450,000,000   450,000,000
Unamortized discount and deferred financing costs (3,075,000)   (3,422,000)
Total Unsecured Senior Notes, Net $ 446,925,000   446,578,000
Kilroy Realty L.P. | Unsecured debt | 6.250% Unsecured Senior Notes      
Debt Instrument [Line Items]      
Unamortized discount (premium), net   $ 4,500,000  
Stated coupon rate 6.25% 6.25%  
Effective interest rate 6.385%    
Long-term debt, gross $ 400,000,000 $ 400,000,000.0 0
Unamortized discount and deferred financing costs (7,159,000)   0
Total Unsecured Senior Notes, Net $ 392,841,000   $ 0