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	Mar. 31, 2017	Dec. 31, 2016
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	34,167	33,537
Mortgage and other loans receivable, Difference	34,167	33,537
Long-term debt, Fair Value	3,151	3,428
Long-term debt, Outstanding Principal Amount	30,747	30,912
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	7	8
Mortgage and other loans receivable, Difference	4	3
Long-term debt, Fair Value	3,151	3,428
Long-term debt, Outstanding Principal Amount	2,370	2,628
Long-term debt, Difference	$ 781	$ 800