Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

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No definition available.

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- Definition

Fair value of the amount outstanding under the credit facility.

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- Definition

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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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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Additional Periods

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No definition available.

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- Definition

Debt Instrument, Term, Additional Period

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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities and Unsecured Term Loans (Details)	1 Months Ended			9 Months Ended
	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Feb. 28, 2018 USD ($)	Sep. 30, 2018 USD ($) period	Dec. 31, 2017 USD ($)
Debt instruments
Revolving credit facility borrowings outstanding				$ 428,200,000
Senior notes payable and other debt, gross				10,584,000,000	$ 11,365,633,000
Senior notes payable and other debt				10,478,455,000	11,276,062,000
Unsecured Term Loan Due 2020
Debt instruments
Senior notes payable and other debt, gross				0	900,000,000
Long-term debt repaid during reporting period	$ 900,000,000.0
Unsecured Term Loan Due 2020 \| LIBOR
Debt instruments
Variable interest rate	0.975%
Unsecured Term Loan Due 2023
Debt instruments
Senior notes payable and other debt, gross	$ 300,000,000.0			300,000,000	0
Unsecured Term Loan Due 2024
Debt instruments
Senior notes payable and other debt, gross	600,000,000.0			600,000,000	0
Unsecured Term Loan Due Facility
Debt instruments
Senior notes payable and other debt, gross	$ 900,000,000.0
Unsecured Term Loan Due Facility \| LIBOR
Debt instruments
Variable interest rate	0.90%
Secured Revolving Construction Credit Facility due 2022
Debt instruments
Revolving credit facility, maximum borrowing capacity				400,000,000.0
Revolving credit facility borrowings outstanding				63,800,000
Revolving credit facility unused borrowing capacity				336,200,000
Senior notes payable and other debt, gross				63,806,000	2,868,000
4.00% Senior Notes due 2019
Debt instruments
Long-term debt repaid during reporting period		$ 97,900,000
2.00% Senior Notes due 2018
Debt instruments
Senior notes payable and other debt, gross				0	700,000,000
Long-term debt repaid during reporting period			$ 700,000,000.0
4.00% Senior Notes due 2028
Debt instruments
Senior notes payable and other debt, gross			$ 650,000,000.0	650,000,000	$ 0
Revolving Credit Facility
Debt instruments
Revolving credit facility, maximum borrowing capacity				$ 3,000,000,000.0
Additional periods \| period				2
Additional period term				6 months
Revolving credit facility borrowings outstanding				$ 514,400,000
Letters of credit outstanding				22,700,000
Revolving credit facility unused borrowing capacity				$ 2,500,000,000
Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate				0.875%
Revolving Credit Facility \| Accordion Feature
Debt instruments
Revolving credit facility, maximum borrowing capacity				$ 3,750,000,000
Unsecured Term Loan Due Facility \| Accordion Feature
Debt instruments
Senior notes payable and other debt	$ 1,500,000,000