FAIR VALUE MEASUREMENTS (Details 10) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgage and other loans receivable, Fair Value	$ 123	$ 107
Long-term debt, Fair Value	9,404	10,766
Fair Value Option
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgage and other loans receivable, Fair Value	123	107
Mortgage and other loans receivable, Outstanding Principal Amount	140	150
Mortgage and other loans receivable, Difference	(17)	(43)
Long-term debt, Fair Value	9,404	10,766
Long-term debt, Outstanding Principal Amount	6,992	8,624
Long-term debt, Difference	$ 2,412	$ 2,142
Disclosure level, past due mortgage or other loans receivable for which the fair value option was elected, number of days past due threshold	90 days	90 days