SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities and Unsecured Term Loans (Details) $ in Millions		12 Months Ended
	Sep. 06, 2023 USD ($)	Dec. 31, 2024 USD ($) period	Dec. 31, 2024 CAD ($) period	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Long-term debt, gross		$ 13,618,802,000		$ 13,568,598,000
Letters of credit outstanding		15,400,000
Commercial paper program capacity		1,000,000,000
Commercial paper notes		0		0
Unsecured Debt | Ventas Realty
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.85%
Long-term debt, gross		500,000,000
Debt Instrument, Accordion Limit	$ 500,000,000	1,250,000,000
Unsecured Term Loan due 2025
Debt Instrument [Line Items]
Unsecured debt		0		377,501,000
Extinguishment of debt		$ 369,400,000	$ 500.0
Unsecured Term Loan due 2025 | Canadian Dollar Offered Rate (CDOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.90%	0.90%
Unsecured term loan due February 2027 | Secured Overnight Financing Rate (SOFR) | Ventas Realty
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.85%	0.85%
3.75% Exchangeable Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate		3.75%
Revolving Credit Facility | Unsecured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 2,750,000,000
Debt instrument, basis spread on variable rate		0.775%	0.775%
Additional period term		6 months	6 months
Accordion feature of debt		$ 3,750,000,000
Line of credit facility, remaining borrowing capacity		2,740,000,000
Letters of credit outstanding		800,000
Line of credit facility, amount outstanding		$ 6,397,000		$ 14,006,000
Additional periods | period		2	2
Revolving Credit Facility | Unsecured Debt | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.10%	0.10%
Letter of Credit | Unsecured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 100,000,000