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FAIR VALUE CHANGES (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Measurement [Abstract]  
Fair value changes
Fair value changes recorded in net income represent gains or losses arising from changes in the fair value of assets and liabilities, including derivative financial instruments, accounted for using the fair value method and are comprised of the following:
FOR THE YEARS ENDED DEC. 31
(MILLIONS)
2018

 
2017

Investment properties
$
1,610

 
$
1,021

Transaction related gains, net of deal costs
1,132

 
637

Financial contracts
(189
)
 
(868
)
Impairments and provisions
(309
)
 
(344
)
Other fair value changes
(450
)
 
(25
)
 
$
1,794

 
$
421