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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commercial Paper, Unsecured Term Loans and Letters of Credit (Details)	3 Months Ended
	Mar. 31, 2026 USD ($) period	Jan. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Debt instruments
Commercial paper program capacity	$ 2,000,000,000.0
Commercial paper notes	65,000,000		$ 0
Ventas Realty
Debt instruments
Unsecured debt	1,250,000,000
Unsecured debt \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity	$ 3,500,000,000
Variable interest rate	0.775%
Additional periods \| period	2
Additional period term	6 months
Letters of credit outstanding	$ 800,000
Fair value of amount outstanding	0		0
Accordion feature of debt	4,500,000,000
Unsecured debt \| Letter of Credit
Debt instruments
Maximum borrowing capacity	100,000,000.0
Unsecured debt \| Letter of Credit \| Credit Agreement
Debt instruments
Letters of credit outstanding	18,600,000
Unsecured term loan due January 2031 \| Ventas Realty
Debt instruments
Accordion feature of debt	1,750,000,000
Unsecured debt			500,000,000
Unsecured term loan due January 2031
Debt instruments
Unsecured debt	$ 700,000,000		500,000,000
Unsecured term loan due January 2031 \| Ventas Realty
Debt instruments
Variable interest rate	0.85%
Unsecured debt	$ 700,000,000	$ 700,000,000
Delayed Draw Term Loan Facility \| Ventas Realty
Debt instruments
Unsecured debt	550,000,000
Unsecured term loan due February 2027
Debt instruments
Unsecured debt	$ 0		$ 200,000,000
Unsecured term loan due February 2027 \| Ventas Realty
Debt instruments
Unsecured debt		$ 200,000,000