SENIOR NOTES PAYABLE AND OTHER DEBT - Summary of Senior Notes Payables and Other Debt (Details) $ in Thousands, $ in Millions	Jun. 30, 2023 USD ($)	Jun. 30, 2023 CAD ($)	Apr. 30, 2023	Dec. 31, 2022 USD ($)
Debt instruments
Interest rate			3.17%
Commercial paper notes	$ 135,000			$ 403,000
Total	13,438,942			12,361,244
Deferred financing costs, net	(81,363)			(63,410)
Unamortized fair value adjustment	19,510			23,535
Unamortized discounts	(22,349)			(24,589)
Senior notes payable and other debt	13,354,740			12,296,780
Unsecured revolving credit facility | Revolving Credit Facility
Debt instruments
Fair value of amount outstanding	35,019			25,230
Unsecured revolving credit facility | Revolving Credit Facility | Borrowings Originally Denominated in CAD
Debt instruments
Mortgage loans and other	12,800			3,700
Unsecured revolving credit facility | Revolving Credit Facility | Borrowings Originally Denominated in GBP
Debt instruments
Mortgage loans and other	$ 22,200			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	123,339			184,515
2.80% Senior Notes, Series E due 2024
Debt instruments
Senior notes	55,181			442,837
Unsecured Term Loan due 2025
Debt instruments
Unsecured term loan	$ 377,758	$ 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 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	$ 358,870			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	$ 453,309			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	$ 226,655			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	$ 3,086,088			$ 2,436,443