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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commercial Paper and Unsecured Term Loans (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($) period	Jun. 30, 2022 CAD ($)	Dec. 31, 2021 USD ($)
Debt instruments
Commercial paper program capacity	$ 1,000,000,000		$ 1,000,000,000
Commercial paper notes	335,300,000		335,300,000		$ 280,000,000
Unsecured debt \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity	2,750,000,000		$ 2,750,000,000
Additional periods \| period			2
Additional period term			6 months
Accordion feature of debt	3,750,000,000		$ 3,750,000,000
Remaining borrowing capacity	2,700,000,000		2,700,000,000
Fair value of amount outstanding	45,594,000		45,594,000		56,448,000
Letters of credit outstanding	25,000,000		$ 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	0	$ 200,000,000	$ 0		200,000,000
Unsecured term loan due 2023 \| LIBOR
Debt instruments
Variable interest rate		0.90%
Unsecured term loan due 2027
Debt instruments
Unsecured debt	500,000,000		500,000,000
Accordion feature limit	1,250,000,000		$ 1,250,000,000
Unsecured term loan due 2027 \| Secured Overnight Financing Rate (SOFR)
Debt instruments
Variable interest rate			0.95%
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt	$ 388,440,000		$ 388,440,000	$ 500	$ 395,757,000
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate	0.90%