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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commerical Paper and Unsecured Term Loans (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) period	Mar. 31, 2021 USD ($)	Mar. 31, 2022 CAD ($)	Dec. 31, 2021 USD ($)
Debt instruments
Commercial paper notes	$ 636,948,000			$ 280,000,000
Commercial paper program capacity	1,000,000,000
Loss on extinguishment of debt	0	$ 27,090,000
Unsecured debt \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity	$ 2,750,000,000
Additional periods \| period	2
Additional period term	6 months
Accordion feature of debt	$ 3,750,000,000
Remaining borrowing capacity	2,700,000,000
Fair value of amount outstanding	46,037,000			56,448,000
Letters of credit outstanding	$ 25,000,000
Unsecured debt \| Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate	0.825%
Unsecured term loan due 2023
Debt instruments
Unsecured debt	$ 200,000,000			200,000,000
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt	$ 400,032,000		$ 500	$ 395,757,000
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate	0.90%