SENIOR NOTES PAYABLE AND OTHER DEBT (Details 3) (USD $)	6 Months Ended
	Jun. 30, 2014
Unsecured revolving credit facility
Debt instruments
Line of credit facility, current borrowing capacity	$ 2,000,000,000
Amount outstanding	179,400,000
Letters of credit outstanding	15,800,000
Remaining borrowing capacity	1,800,000,000
Unsecured revolving credit facility | London Interbank Offered Rate (LIBOR) [Member]
Debt instruments
Debt instrument, description of variable rate basis	LIBOR
Debt instrument, basis spread on variable rate	1.00%
Unsecured Term Loan Due 2018
Debt instruments
Line of credit facility, current borrowing capacity	200,000,000
Unsecured Term Loan Due 2018 | London Interbank Offered Rate (LIBOR) [Member]
Debt instruments
Debt instrument, description of variable rate basis	LIBOR
Debt instrument, basis spread on variable rate	1.05%
Unsecured Term Loan Due 2019
Debt instruments
Line of credit facility, current borrowing capacity	800,000,000
Unsecured Term Loan Due 2019 | London Interbank Offered Rate (LIBOR) [Member]
Debt instruments
Debt instrument, basis spread on variable rate	1.05%
Unsecured line of credit
Debt instruments
Line of credit facility, maximum borrowing capacity	3,500,000,000
Amount outstanding	$ 6,400,000