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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value amount of debt instrument that was repurchased.

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Weighted average interest rate of debt outstanding.

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Amount of increase in the fair value of derivatives recognized in the income statement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Public offering price as a percent of par.

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SENIOR NOTES PAYABLE AND OTHER DEBT - Narrative (Details)	1 Months Ended		3 Months Ended
	Apr. 30, 2018 USD ($)	Feb. 28, 2018 USD ($)	Mar. 31, 2018 USD ($) period	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt instruments
Unsecured revolving credit facility borrowings outstanding			$ 701,800,000
Senior notes payable and other debt, gross			11,143,235,000		$ 11,365,633,000
Proceeds from public offering sale of debt			738,519,000	$ 797,214,000
Loss on extinguishment of debt			$ (10,977,000)	$ (309,000)
Derivative notional amount					200,000,000
Debt, weighted average interest rate			9.90%
Derivative, Gain on Derivative		$ 10,000,000
Forward Starting Swap
Debt instruments
Derivative notional amount			$ 215,000,000
Debt, weighted average interest rate			2.84%
Subsequent Event \| Forward Starting Swap
Debt instruments
Derivative notional amount	$ 35,000,000
Unsecured term loan due 2020
Debt instruments
Senior notes payable and other debt, gross			$ 900,000,000		900,000,000
Unsecured term loan due 2020 \| LIBOR
Debt instruments
Variable interest rate			0.975%
Secured revolving construction credit facility
Debt instruments
Unsecured revolving credit facility, maximum borrowing capacity			$ 400,000,000
Revolving credit facility unused borrowing capacity			381,400,000
Senior notes payable and other debt, gross			18,632,000		2,868,000
4.00% Senior Notes due 2028
Debt instruments
Senior notes payable and other debt, gross			$ 650,000,000		0
Interest rate		4.00%	4.00%
Public offering price as percent of par		99.233%
Proceeds from public offering sale of debt		$ 645,000,000
4.00% Senior Notes due 2019
Debt instruments
Interest rate		4.00%
Public offering price as percent of par		101.83%
Senior notes redeemed		$ 502,100,000
Loss on extinguishment of debt		$ 11,000,000
4.00% Senior Notes due 2019 \| Subsequent Event
Debt instruments
Senior notes payable and other debt, gross	$ 97,900,000
Interest rate	4.00%
Loss on extinguishment of debt	$ 1,800,000
2.00% Senior Notes due 2018
Debt instruments
Senior notes payable and other debt, gross			$ 0		$ 700,000,000
Interest rate		2.00%	2.00%
Repayments of long-term debt		$ 700,000,000
Revolving Credit Facility
Debt instruments
Unsecured revolving credit facility, maximum borrowing capacity			$ 3,000,000,000.0
Additional periods \| period			2
Additional period term			6 months
Unsecured revolving credit facility borrowings outstanding			$ 794,400,000
Letters of credit outstanding			14,500,000
Revolving credit facility unused borrowing capacity			$ 2,200,000,000
Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate			0.875%
Revolving Credit Facility \| Accordion Feature
Debt instruments
Unsecured revolving credit facility, maximum borrowing capacity			$ 3,750,000,000.00