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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
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage and other loans receivable, Fair Value $ 0 $ 5
Mortgage and other loans receivable, Outstanding Principal Amount 43,532 37,345
Long-term debt, Fair Value 2,213 2,888
Long-term debt, Outstanding Principal Amount 34,540 31,640
Fair Value Option    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage and other loans receivable, Fair Value 0 5
Mortgage and other loans receivable, Outstanding Principal Amount 0 5
Mortgage and other loans receivable, Difference 0 0
Long-term debt, Fair Value 2,213 2,888
Long-term debt, Outstanding Principal Amount 1,653 2,280
Long-term debt, Difference $ 560 $ 608