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Secured and Unsecured Debt of the Operating Partnership - Unsecured Revolving Credit Facility (Details) - Revolving credit facility - Kilroy Realty L.P.	1 Months Ended
	Apr. 29, 2021 USD ($) extensionOption	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | $	$ 1,100,000,000	$ 1,100,000,000	$ 750,000,000
Line of Credit, Number of Extension Options | extensionOption	2
Line of Credit, Extension Period	6 months
Debt Instrument, Interest Rate Reduction if Sustainability Performance Targets Met	0.01%

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- Definition

Debt Instrument, Interest Rate Reduction if Sustainability Performance Targets Met

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- Definition

Line of Credit, Extension Period

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- Definition

Line of Credit, Number of Extension Options

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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