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NON-RECOURSE BORROWINGS - Schedule of Current and Non-current property specific mortgages (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 63,721 $ 52,442
Property-specific borrowings    
Disclosure of detailed information about borrowings [line items]    
Current 8,800 7,655
Non-current 54,921 44,787
Borrowings $ 63,721 $ 52,442