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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commercial Paper, Unsecured Term Loans and Letters of Credit (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) period	Mar. 31, 2023 CAD ($)	Dec. 31, 2022 USD ($)
Debt instruments
Letters of credit outstanding	$ 14,500,000
Commercial paper program capacity	1,000,000,000
Commercial paper notes	425,000,000		$ 403,000,000
Letter of Credit
Debt instruments
Maximum borrowing capacity	100,000,000
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	40,210,000		25,230,000
Letters of credit outstanding	$ 1,200,000
Unsecured debt \| Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate	0.825%
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt	$ 369,959,000	$ 500	$ 369,031,000
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate	0.90%