Commitments and Contingencies (Narrative) (Details) ft² in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) ft²	Jul. 31, 2018 USD ($) ft²
Other Commitments
Guarantees and master leases	$ 1,648,000,000
Outstanding letters of credit	15,273,000
Clawback payment	27,100,000
Commitment to fund additional capital to partially owned entities	10,300,000
Other commitment	494,000,000
General Liability
Insurance
Insurance limit per property	300,000,000
Insurance limit per occurrence	300,000,000
Disease Coverage
Insurance
Insurance limit per property	250,000,000
All Risk And Rental Value
Insurance
Insurance limit per occurrence	2,000,000,000
Earthquake California Properties
Insurance
Insurance limit per occurrence	350,000,000
Insurance maximum coverage limit in aggregate	$ 350,000,000
Vornado deductible, percentage of property value	5.00%
Terrorism Acts
Insurance
Insurance limit per occurrence	$ 6,000,000,000
Insurance maximum coverage limit in aggregate	6,000,000,000
Non-Certified Acts of Terrorism
Insurance
Insurance maximum coverage limit in aggregate	1,200,000,000
NBCR
Insurance
Insurance limit per occurrence	5,000,000,000
Insurance maximum coverage limit in aggregate	5,000,000,000
PPIC | NBCR
Insurance
Insurance deductible	$ 1,785,910
Insurance deductible percentage of balance of covered loss	20.00%
Farley Office and Retail Building
Other Commitments
Square footage of real estate property (in sqft) | ft²	845
Equity method ownership percentage	95.00%
Joint Venture | Farley Office and Retail Building
Other Commitments
Equity method ownership percentage	95.00%
Tax credit advisor capital contributions	$ 92,400,000
Affiliated Entity | Farley Office and Retail Building
Other Commitments
Equity method ownership percentage	5.00%
345 Montgomery Street | Regus PLC
Other Commitments
Contractual obligation (up to)		$ 90,000,000
Subsidiary of Regus PLC | 345 Montgomery Street
Other Commitments
Square footage of real estate property (in sqft) | ft²		78
Lessor, lease not yet commenced, term of contract (years)		15 years