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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, 2022 USD ($)	Mar. 31, 2022 CAD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Debt instruments
Commercial paper notes	$ 636,948		$ 280,000
Total	12,477,876		12,093,138
Deferred financing costs, net	(67,022)		(69,925)
Unamortized fair value adjustment	30,581		32,888
Unamortized discounts	(27,692)		(28,557)
Senior notes payable and other debt	12,413,743		12,027,544
Unsecured revolving credit facility \| Revolving Credit Facility
Debt instruments
Fair value of amount outstanding	46,037		56,448
Unsecured revolving credit facility \| Revolving Credit Facility \| Borrowings Originally Denominated in CAD
Debt instruments
Mortgage loans and other	21,600		30,900
Unsecured revolving credit facility \| Revolving Credit Facility \| Borrowings Originally Denominated in GBP
Debt instruments
Mortgage loans and other	24,400		25,600
Unsecured term loan due 2023
Debt instruments
Unsecured term loan	$ 200,000		200,000
2.55% Senior Notes, Series D due 2023
Debt instruments
Interest rate	2.55%	2.55%
Senior notes	$ 220,018		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	$ 200,016		197,879
2.80% Senior Notes, Series E due 2024
Debt instruments
Interest rate	2.80%	2.80%
Senior notes	$ 480,038		474,909
Unsecured Term Loan due 2025
Debt instruments
Unsecured term loan	$ 400,032	$ 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
2.45% Senior Notes, Series G Due 2027
Debt instruments
Interest rate	2.45%	2.45%
Senior notes	$ 380,030			$ 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	$ 240,019			$ 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	$ 2,449,515		$ 2,431,831