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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commerical Paper and Unsecured Term Loans (Details) $ in Billions	3 Months Ended
	Mar. 31, 2020 USD ($) period	Mar. 31, 2019 USD ($)	Mar. 31, 2020 CAD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt instruments
Commercial paper program capacity				$ 1,000,000,000.0
Commercial paper				0	$ 567,450,000
Loss on extinguishment of debt, net	$ 0	$ 405,000
Unsecured debt \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity				3,000,000,000.0
Additional periods \| period	2
Additional period term	6 months
Accordion feature of debt				3,750,000,000
Fair value of amount outstanding				2,888,159,000	120,787,000
Letters of credit outstanding				24,000,000.0
Line of credit, remaining availability less commercial paper				87,900,000
Unsecured debt \| Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate	0.875%
Unsecured Term Loan Due 2023
Debt instruments
Accordion feature of debt				800,000,000.0
Unsecured debt				200,000,000	200,000,000
Unsecured Term Loan Due 2023 \| LIBOR
Debt instruments
Variable interest rate	0.90%
Secured revolving construction credit facility due 2022 \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity				400,000,000.0
Fair value of amount outstanding				152,427,000	160,492,000
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt			$ 0.5	$ 355,644,000	$ 385,030,000
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate	0.90%