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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commerical Paper and Unsecured Term Loans (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) period	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt instruments
Commercial paper program capacity	$ 1,000,000,000.0	$ 1,000,000,000.0		$ 1,000,000,000.0
Commercial paper	270,000,000.0	270,000,000.0		270,000,000.0		$ 0
Senior notes payable and other debt, gross	10,346,903,000	10,346,903,000		10,346,903,000
Loss on extinguishment of debt, net		4,022,000	$ (93,000)	4,427,000	$ 10,884,000
Unsecured Term Loan Due 2023
Debt instruments
Accordion feature of debt	800,000,000.0	800,000,000.0		800,000,000.0
Repayments of debt	100,000,000.0
Senior notes payable and other debt, gross	200,000,000	200,000,000		200,000,000		300,000,000
Unsecured Term Loan due 2024
Debt instruments
Repayments of debt	600,000,000.0
Senior notes payable and other debt, gross	0	0		0		$ 600,000,000
Unsecured Term Loans Due 2023 and 2024
Debt instruments
Loss on extinguishment of debt, net		3,200,000
Secured Revolving Construction Credit Facility due 2022
Debt instruments
Revolving credit facility, maximum borrowing capacity	400,000,000.0	400,000,000.0		400,000,000.0
Revolving credit facility borrowings outstanding	123,200,000	123,200,000		$ 123,200,000
LIBOR \| Unsecured Term Loan Due 2023
Debt instruments
Variable interest rate				0.90%
Revolving Credit Facility
Debt instruments
Revolving credit facility, maximum borrowing capacity	3,000,000,000.0	3,000,000,000.0		$ 3,000,000,000.0
Additional periods \| period				2
Additional period term				6 months
Accordion feature of debt	3,750,000,000	3,750,000,000		$ 3,750,000,000
Revolving credit facility borrowings outstanding	227,300,000	227,300,000		227,300,000
Letters of credit outstanding	23,700,000	23,700,000		23,700,000
Line of credit, remaining availability less commercial paper	$ 2,500,000,000	$ 2,500,000,000		$ 2,500,000,000
Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate				0.875%