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, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage and other loans receivable, Outstanding Principal Amount	$ 44,256	$ 43,532
Mortgage and other loans receivable, Difference	44,256	43,532
Long-term debt, Fair Value	2,263	2,213
Long-term debt, Outstanding Principal Amount	35,776	34,540
Fair Value Option
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,263	2,213
Long-term debt, Outstanding Principal Amount	1,685	1,653
Long-term debt, Difference	$ 578	$ 560