Secured and Unsecured Debt of the Company	12 Months Ended
Secured and Unsecured Debt of the Company	Dec. 31, 2012
Debt Disclosure [Abstract]
Secured and Unsecured Debt of the Company	Secured and Unsecured Debt of the Company In this Note 6, the "Company" refers solely to Kilroy Realty Corporation and not to any of our subsidiaries. The Company itself does not hold any indebtedness. All of our secured and unsecured debt is held directly by the Operating Partnership. The Company generally guarantees all the Operating Partnership's unsecured debt obligations including the unsecured revolving credit facility, the $150.0 million unsecured term loan facility, 6.625% unsecured senior notes due 2020, the 4.80% unsecured senior notes due 2018, the 5.00% unsecured senior notes due 2015, the 6.45% unsecured senior notes due 2014, and the 4.25% Exchangeable Notes. As of both December 31, 2012 and 2011, the Operating Partnership had $1.5 billion outstanding in total under these unsecured debt obligations. In addition, although the remaining $0.6 billion and $0.4 billion of the Operating Partnership's debt for December 31, 2012 and 2011, respectively, is secured and non-recourse to the Company, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities. The Company and the Operating Partnership are both named parties to the capped call option transactions discussed further in Note 7. Debt Covenants and Restrictions One of the covenants contained within the credit facility and the term loan facility, as discussed further below in Note 7 prohibits the Company from paying dividends in excess of 95% of funds from operations ("FFO").

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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