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SENIOR NOTES PAYABLE AND OTHER DEBT - Summary of Senior Notes Payables and Other Debt (Details) $ in Thousands, $ in Millions	Mar. 31, 2023 USD ($)	Mar. 31, 2023 CAD ($)	Dec. 31, 2022 USD ($)
Debt instruments
Commercial paper notes	$ 425,000		$ 403,000
Total	12,406,943		12,361,244
Deferred financing costs, net	(62,321)		(63,410)
Unamortized fair value adjustment	21,485		23,535
Unamortized discounts	(23,601)		(24,589)
Senior notes payable and other debt	12,342,506		12,296,780
Unsecured revolving credit facility \| Revolving Credit Facility
Debt instruments
Fair value of amount outstanding	40,210		25,230
Unsecured revolving credit facility \| Revolving Credit Facility \| Borrowings Originally Denominated in CAD
Debt instruments
Mortgage loans and other	18,500		3,700
Unsecured revolving credit facility \| Revolving Credit Facility \| Borrowings Originally Denominated in GBP
Debt instruments
Mortgage loans and other	$ 21,700		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	184,980		184,515
2.80% Senior Notes, Series E due 2024
Debt instruments
Senior notes	443,951		442,837
Unsecured Term Loan due 2025
Debt instruments
Unsecured term loan	$ 369,959	$ 500	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
Unsecured term loan due 2027
Debt instruments
Senior notes	$ 500,000		500,000
2.45% Senior Notes, Series G Due 2027
Debt instruments
Interest rate	2.45%	2.45%
Senior notes	$ 351,461		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
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	$ 221,976		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	$ 22,823		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
Mortgage loans and other	$ 2,644,183		$ 2,436,443