SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commercial Paper, Unsecured Term Loans and Letters of Credit (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) period	Jun. 30, 2023 CAD ($)	Dec. 31, 2022 USD ($)
Debt instruments
Letters of credit outstanding	$ 14,700,000	$ 14,700,000
Commercial paper program capacity	1,000,000,000	1,000,000,000
Commercial paper notes	135,000,000	135,000,000		$ 403,000,000
Letter of Credit
Debt instruments
Maximum borrowing capacity	100,000,000	100,000,000
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	35,019,000	35,019,000		25,230,000
Letters of credit outstanding	1,200,000	$ 1,200,000
Unsecured debt | Revolving Credit Facility | SOFR
Debt instruments
Variable interest rate		0.925%
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt	$ 377,758,000	$ 377,758,000	$ 500.0	$ 369,031,000
Unsecured Term Loan due 2025 | Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate	0.90%