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COVER - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 02, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-13779    
Entity Registrant Name W. P. Carey Inc.    
Entity Incorporation, State MD    
Entity Tax Identification Number 45-4549771    
Entity Address, Street One Manhattan West, 395 9th Avenue, 58th Floor    
Entity Address, City New York,    
Entity Address, State NY    
Entity Address, Postal Zip Code 10001    
City Area Code 212    
Local Phone Number 492-1100    
Title of each class Common Stock, $0.001 Par Value    
Trading Symbol(s) WPC    
Name of exchange on which registered 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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 14.4
Entity Common Stock, Shares Outstanding   218,672,432  
Documents Incorporated by Reference
The registrant incorporates by reference its definitive Proxy Statement with respect to its 2024 Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission within 120 days following the end of its fiscal year, into Part III of this Annual Report on Form 10-K.
    
Entity Central Index Key 0001025378    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY