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SENIOR NOTES PAYABLE AND OTHER DEBT - Summary of Senior Notes Payables and Other Debt (Details) $ in Thousands, $ in Millions	Jun. 30, 2022 USD ($)	Jun. 30, 2022 CAD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt instruments
Commercial paper notes	$ 335,300			$ 280,000
Total	12,393,495			12,093,138
Deferred financing costs, net	(66,963)			(69,925)
Unamortized fair value adjustment	28,165			32,888
Unamortized discounts	(26,557)			(28,557)
Senior notes payable and other debt	12,328,140			12,027,544
Unsecured revolving credit facility \| Revolving Credit Facility
Debt instruments
Fair value of amount outstanding	45,594			56,448
Unsecured revolving credit facility \| Revolving Credit Facility \| Borrowings Originally Denominated in CAD
Debt instruments
Mortgage loans and other	23,300			30,900
Unsecured revolving credit facility \| Revolving Credit Facility \| Borrowings Originally Denominated in GBP
Debt instruments
Mortgage loans and other	22,300			25,600
Unsecured term loan due 2023
Debt instruments
Unsecured term loan	$ 0		$ 200,000	200,000
2.55% Senior Notes, Series D due 2023
Debt instruments
Interest rate	2.55%	2.55%
Senior notes	$ 213,642			217,667
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
Interest rate	4.125%	4.125%
Senior notes	$ 194,220			197,879
2.80% Senior Notes, Series E due 2024
Debt instruments
Interest rate	2.80%	2.80%
Senior notes	$ 466,128			474,909
Unsecured Term Loan due 2025
Debt instruments
Unsecured term loan	$ 388,440	$ 500		395,757
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			0
Unsecured term loan	$ 500,000
2.45% Senior Notes, Series G Due 2027
Debt instruments
Interest rate	2.45%	2.45%
Senior notes	$ 369,018			375,970
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	$ 233,064			237,454
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	$ 2,422,866			$ 2,431,831