Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 21, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-33824
Entity Registrant Name	Kennedy-Wilson Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-0508760
Entity Address, Address Line One	151 S El Camino Drive
Entity Address, City or Town	Beverly Hills,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90212
City Area Code	310
Local Phone Number	887-6400
Title of 12(b) Security	Common Stock, $.0001 par value
Trading Symbol	KW
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 1,966,551,848
Entity Common Stock, Shares Outstanding		137,967,125
Documents Incorporated by Reference	Part III of this report incorporates certain information by reference from the registrant’s definitive proxy statement for the annual meeting of stockholders to be held on or around June 8, 2023, which proxy statement will be filed no later than 120 days after the close of the registrant’s fiscal year ended December 31, 2022.
Entity Central Index Key	0001408100
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false