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	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage and other loans receivable, Fair Value	$ 5	$ 11
Mortgage and other loans receivable, Outstanding Principal Amount	36,434	33,537
Mortgage and other loans receivable, Difference	36,434	33,537
Long-term debt, Fair Value	2,998	3,428
Long-term debt, Outstanding Principal Amount	31,039	30,912
Fair Value Option
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage and other loans receivable, Fair Value	5	11
Mortgage and other loans receivable, Outstanding Principal Amount	5	8
Mortgage and other loans receivable, Difference	0	3
Long-term debt, Fair Value	2,998	3,428
Long-term debt, Outstanding Principal Amount	2,353	2,628
Long-term debt, Difference	$ 645	$ 800