SENIOR NOTES PAYABLE AND OTHER DEBT - Summary of Senior Notes Payables and Other Debt (Details) $ in Thousands, $ in Millions	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CAD ($)	Sep. 06, 2023 USD ($)	Jul. 31, 2023	Dec. 31, 2022 USD ($)
Debt instruments
Commercial paper notes	$ 0				$ 403,000
Total	13,479,362				12,361,244
Deferred financing costs, net	(87,172)				(63,410)
Unamortized fair value adjustment	17,547				23,535
Unamortized discounts	(21,239)				(24,589)
Senior notes payable and other debt	13,388,498				12,296,780
Unsecured revolving credit facility | Ventas Realty
Debt instruments
Senior notes			$ 200,000
Mortgage loans and other	500,000
Unsecured revolving credit facility | Revolving Credit Facility
Debt instruments
Fair value of amount outstanding	31,677				25,230
Unsecured revolving credit facility | Revolving Credit Facility | Borrowings Originally Denominated in CAD
Debt instruments
Mortgage loans and other	12,500				3,700
Unsecured revolving credit facility | Revolving Credit Facility | Borrowings Originally Denominated in GBP
Debt instruments
Mortgage loans and other	$ 19,200				21,500
2.55% Senior Notes, Series D due 2023
Debt instruments
Interest rate	2.55%	2.55%
Senior notes	$ 0				202,967
3.50% Senior Notes due 2024
Debt instruments
Interest rate	3.50%	3.50%
Senior notes	$ 400,000				400,000
3.75% Senior Notes due 2024
Debt instruments
Interest rate	3.75%	3.75%
Senior notes	$ 400,000				400,000
4.125% Senior Notes, Series B due 2024
Debt instruments
Senior notes	120,242				184,515
2.80% Senior Notes, Series E due 2024
Debt instruments
Senior notes	53,795				442,837
Unsecured Term Loan due 2025
Debt instruments
Unsecured term loan	$ 368,270	$ 500.0			369,031
3.50% Senior Notes due 2025
Debt instruments
Interest rate	3.50%	3.50%
Senior notes	$ 600,000				600,000
2.65% Senior Notes due 2025
Debt instruments
Interest rate	2.65%	2.65%
Senior notes	$ 450,000				450,000
4.125% Senior Notes due 2026
Debt instruments
Interest rate	4.125%	4.125%
Senior notes	$ 500,000				500,000
3.25% Senior Notes due 2026
Debt instruments
Interest rate	3.25%	3.25%
Senior notes	$ 450,000				450,000
3.75% Exchangeable Senior Notes due 2026
Debt instruments
Interest rate	3.75%	3.75%
Senior notes	$ 862,500				0
Unsecured term loan due February 2027
Debt instruments
Senior notes	$ 200,000				0
Unsecured term loan due June 2027
Debt instruments
Senior notes					500,000
2.45% Senior Notes, Series G Due 2027
Debt instruments
Interest rate	2.45%	2.45%
Senior notes	$ 349,856				350,579
3.85% Senior Notes due 2027
Debt instruments
Interest rate	3.85%	3.85%
Senior notes	$ 400,000				400,000
4.00% Senior Notes due 2028
Debt instruments
Interest rate	4.00%	4.00%
Senior notes	$ 650,000				650,000
5.398% Senior Notes due 2028
Debt instruments
Interest rate	5.398%	5.398%
Senior notes	$ 441,924				0
4.40% Senior Notes due 2029
Debt instruments
Interest rate	4.40%	4.40%
Senior notes	$ 750,000				750,000
3.00% Senior Notes due 2030
Debt instruments
Interest rate	3.00%	3.00%
Senior notes	$ 650,000				650,000
4.75% Senior Notes due 2030
Debt instruments
Interest rate	4.75%	4.75%
Senior notes	$ 500,000				500,000
2.50% Senior Notes due 2031
Debt instruments
Interest rate	2.50%	2.50%
Senior notes	$ 500,000				500,000
3.30% Senior Notes, Series H Due 2031
Debt instruments
Interest rate	3.30%	3.30%
Senior notes	$ 220,962				221,419
6.90% Senior Notes due 2037
Debt instruments
Interest rate	6.90%	6.90%
Senior notes	$ 52,400				52,400
6.59% Senior Notes due 2038
Debt instruments
Interest rate	6.59%	6.59%
Senior notes	$ 21,413				22,823
5.70% Senior Notes due 2043
Debt instruments
Interest rate	5.70%	5.70%
Senior notes	$ 300,000				300,000
4.375% Senior Notes due 2045
Debt instruments
Interest rate	4.375%	4.375%
Senior notes	$ 300,000				300,000
4.875% Senior Notes due 2049
Debt instruments
Interest rate	4.875%	4.875%
Senior notes	$ 300,000				300,000
Mortgage loans and other
Debt instruments
Interest rate				5.91%
Mortgage loans and other	$ 3,106,323				$ 2,436,443