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INVESTMENT PROPERTIES - Schedule of Changes in Fair Value of Investment Properties (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Disclosure of detailed information about investment property [line items]  
Fair value, beginning of period $ 96,782
Additions 5,998
Right-of-use assets 3,700
Dispositions (3,049)
Fair value changes 1,707
Foreign currency translation and other (428)
Fair value, end of period2 $ 101,010