FAIR VALUE MEASUREMENTS (Details - Difference between fair values and the aggregate contractual principal amounts of mortgage and other loans receivable and long-term borrowings for which the fair value option was elected) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage and other loans receivable, Fair Value	$ 11	$ 6
Mortgage and other loans receivable, Difference	29,873	25,261
Long-term debt, Fair Value	3,670	5,466
Long-term debt, Outstanding Principal Amount	29,350	31,217
Fair Value Option
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage and other loans receivable, Fair Value	11	6
Mortgage and other loans receivable, Outstanding Principal Amount	9	4
Mortgage and other loans receivable, Difference	2	2
Long-term debt, Fair Value	3,670	5,466
Long-term debt, Outstanding Principal Amount	2,675	4,101
Long-term debt, Difference	$ 995	$ 1,365
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