SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities and Unsecured Term Loans (Details)	3 Months Ended
Mar. 31, 2019 USD ($) period	Dec. 31, 2018 USD ($)
Debt instruments
Revolving credit facility borrowings outstanding	$ 164,600,000
Commercial paper program capacity	1,000,000,000
Senior notes payable and other debt, gross	10,789,178,000
Unsecured Term Loan due 2023
Debt instruments
Senior notes payable and other debt, gross	300,000,000	$ 300,000,000
Unsecured Term Loan due 2024
Debt instruments
Senior notes payable and other debt, gross	600,000,000	$ 600,000,000
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	104,600,000
Revolving credit facility unused borrowing capacity	295,400,000
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	$ 52,100,000
Letters of credit outstanding	23,100,000
Revolving credit facility unused borrowing capacity	$ 2,900,000,000
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
Potential borrowing capacity under accordion feature	$ 1,500,000,000

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

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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.

+ References

No definition available.

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- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

Additional Periods

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- Definition

Commercial paper program capacity

+ References

No definition available.

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- Definition

Debt Instrument, Term, Additional Period

+ References

No definition available.

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- Definition

Potential borrowing capacity of debt instrument under accordion feature

+ References

No definition available.

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