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Subsequent Events - Narrative (Details) - USD ($) $ in Millions	Jan. 28, 2022	Jan. 12, 2022	Dec. 31, 2021
Subsequent Event [Line Items]
Number of shares available for grant (in shares)			1,400,000
Subsequent event
Subsequent Event [Line Items]
Payments of dividends		$ 61.8
Subsequent event | Kilroy Realty 2006 Incentive Award Plan | Market measure-based Restricted Stock Units (RSUs) | Key Employees
Subsequent Event [Line Items]
Recognition period	3 years
Subsequent event | Kilroy Realty 2006 Incentive Award Plan | Time-Based Restricted Stock Units (RSUs) | Key Employees
Subsequent Event [Line Items]
Number of shares available for grant (in shares)	158,170
Subsequent event | Kilroy Realty 2006 Incentive Award Plan | Performance-Based Restricted Stock Units (RSUs) | Key Employees
Subsequent Event [Line Items]
Number of shares available for grant (in shares)	193,111

X

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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