LONG-TERM DEBT - Components and Additional Disclosures (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended		0 Months Ended
	Sep. 30, 2027	Oct. 31, 2013	Sep. 09, 2009 Senior Notes 2015 [Member]	Oct. 24, 2007 Senior Notes 2017 [Member]	Jul. 13, 2010 Senior Notes 2020 [Member]	Sep. 10, 2012 Senior Notes 2022 [Member]	Jun. 18, 2013 Senior Notes 2023 [Member]	Sep. 30, 2027 Other Debt [Member]
Debt Instrument [Line Items]
Issuance date of Debt			Sep. 09, 2009	Oct. 24, 2007	Jul. 13, 2010	Sep. 10, 2012	Jun. 18, 2013
Aggregate face amount of debt			$ 500	$ 600	$ 500	$ 400	$ 600
Issue rate percentage of principal amount			99.69%	99.60%	99.54%	99.80%	99.544%
Maturity date	Sep. 30, 2027		Sep. 14, 2015	Nov. 01, 2017	Jul. 15, 2020	Oct. 01, 2022	Jul. 15, 2023
Fixed interest rate per annum (in hundredths)			5.50%	6.50%	5.00%	3.20%	3.875%
Interest payment frequency			semi-annually	semi-annually	semi-annually	semi-annually	semi annually	March, June, September and December of each year
Date payments commenced			Mar. 14, 2010	May 01, 2008	Jan. 15, 2011	Apr. 01, 2013	Jan. 15, 2014
Issuance cost incurred on Senior Notes offered			3	5	3	3	5
Mortgage Loans on Real Estate		$ 46