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SENIOR NOTES PAYABLE AND OTHER DEBT (Details) (USD $)
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1 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2014
Unsecured Line of Credit [Member]
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Dec. 31, 2013
Unsecured Line of Credit [Member]
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Mar. 31, 2014
Unsecured revolving credit facilities
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Dec. 31, 2013
Unsecured revolving credit facilities
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Mar. 31, 2014
6.25% Senior Notes due 2013
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Dec. 31, 2013
6.25% Senior Notes due 2013
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Mar. 31, 2014
3.125% Senior Notes due 2015
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Dec. 31, 2013
3.125% Senior Notes due 2015
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Mar. 31, 2014
6% Senior Notes due 2015
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Dec. 31, 2013
6% Senior Notes due 2015
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Mar. 31, 2014
1.55% Senior Notes due 2016
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Dec. 31, 2013
1.55% Senior Notes due 2016
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Mar. 31, 2014
2.00% Senior Notes due 2018
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Dec. 31, 2013
2.00% Senior Notes due 2018
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Mar. 31, 2014
Unsecured Term Loan Due 2018 Number Two [Member]
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Dec. 31, 2013
Unsecured Term Loan Due 2018 Number Two [Member]
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Mar. 31, 2014
Unsecured Term Loan Due 2019 [Member]
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Dec. 31, 2013
Unsecured Term Loan Due 2019 [Member]
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Mar. 31, 2014
4.00% senior notes due 2019
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Dec. 31, 2013
4.00% senior notes due 2019
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Mar. 31, 2014
2.700% Senior Notes due 2020
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Dec. 31, 2013
2.700% Senior Notes due 2020
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Mar. 31, 2014
4.750% Senior Notes due 2021
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Dec. 31, 2013
4.750% Senior Notes due 2021
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Mar. 31, 2014
4.25% senior notes due 2022
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Dec. 31, 2013
4.25% senior notes due 2022
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Mar. 31, 2014
3.25% senior notes due 2022
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Dec. 31, 2013
3.25% senior notes due 2022
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Mar. 31, 2014
6.90% Senior Notes due 2037
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Dec. 31, 2013
6.90% Senior Notes due 2037
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Mar. 31, 2014
6.59% Senior Notes due 2038
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Dec. 31, 2013
6.59% Senior Notes due 2038
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Mar. 31, 2014
5.45% Senior Notes due 2043
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Dec. 31, 2013
5.45% Senior Notes due 2043
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Mar. 31, 2014
Five Point Seven Zero Percent Senior Notes, Due 2043 [Member]
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Dec. 31, 2013
Five Point Seven Zero Percent Senior Notes, Due 2043 [Member]
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Mar. 31, 2014
Mortgage loans and other
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Dec. 31, 2013
Mortgage loans and other
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Mar. 31, 2014
Unsecured term loan
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Dec. 31, 2013
Mortgage Loans Held for Sale [Member]
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Mar. 31, 2014
Canada, Dollars
Unsecured term loan
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Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Unsecured revolving credit facilities
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Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Unsecured Term Loan Due 2018 Number Two [Member]
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| Debt instruments | |||||||||||||||||||||||||||||||||||||||||||||
| Line of Credit Facility, Current Borrowing Capacity | $ 2,000,000,000 | $ 200,000,000 | $ 800,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Line of Credit Facility, Maximum Borrowing Capacity | 3,500,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Amount outstanding | 192,300,000 | 559,300,000 | |||||||||||||||||||||||||||||||||||||||||||
| Total Maturities | 9,442,636,000 | 9,320,477,000 | 559,299,000 | 376,343,000 | 400,000,000 | 400,000,000 | 234,420,000 | 234,420,000 | 550,000,000 | 550,000,000 | 700,000,000 | 700,000,000 | 200,000,000 | 200,000,000 | 796,165,000 | 800,702,000 | 600,000,000 | 600,000,000 | 500,000,000 | 500,000,000 | 700,000,000 | 700,000,000 | 600,000,000 | 600,000,000 | 500,000,000 | 500,000,000 | 52,400,000 | 52,400,000 | 22,973,000 | 22,973,000 | 258,750,000 | 258,750,000 | 300,000,000 | 300,000,000 | 2,468,629,000 | 2,524,889,000 | 1,000,000,000 | 13,100,000 | 112,600,000 | ||||||
| Interest rate (as a percent) | 6.25% | 6.25% | 3.125% | 3.125% | 6.00% | 6.00% | 2.00% | 2.00% | 4.00% | 4.00% | 2.70% | 2.70% | 4.75% | 4.75% | 4.25% | 4.25% | 3.25% | 3.25% | 6.90% | 6.90% | 6.59% | 6.59% | 5.45% | 5.45% | |||||||||||||||||||||
| Unamortized fair value adjustment | 62,578,000 | 69,611,000 | |||||||||||||||||||||||||||||||||||||||||||
| Unamortized discounts | (24,163,000) | (25,096,000) | |||||||||||||||||||||||||||||||||||||||||||
| Senior notes payable and other debt | $ 9,481,051,000 | $ 9,364,992,000 | |||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Description of Variable Rate Basis | LIBOR | LIBOR | |||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Basis Spread on Variable Rate | 1.00% | 1.05% | |||||||||||||||||||||||||||||||||||||||||||