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, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage and other loans receivable, Fair Value	$ 11	$ 11
Mortgage and other loans receivable, Outstanding Principal Amount	33,537	29,873
Long-term debt, Fair Value	3,428	3,670
Long-term debt, Outstanding Principal Amount	30,912	29,249
Fair Value Option
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage and other loans receivable, Fair Value	11	11
Mortgage and other loans receivable, Outstanding Principal Amount	8	9
Mortgage and other loans receivable, Difference	3	2
Long-term debt, Fair Value	3,428	3,670
Long-term debt, Outstanding Principal Amount	2,628	2,675
Long-term debt, Difference	$ 800	$ 995
Disclosure level, past due mortgage or other loans receivable for which the fair value option was elected, number of days past due threshold	0 days