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Investment and other income
 6 Months Ended
Jun. 30, 2020
Investment and other income
4.  Investment and other income
Investment and other income included gains and losses on asset sales as follows:
 
        Second Quarter     
    Six Months
    to June 30
  
millions of Canadian dollars
  
2020
     2019     
2020
      2019  
Proceeds from asset sales
  
 
40
 
     14     
 
49
 
      36  
Book value of asset sales
  
 
30
 
     3     
 
32
 
      30  
Gain (loss) on asset sales, before tax
  
 
10
 
     11     
 
17
 
      6  
Gain (loss) on asset sales, after tax
  
 
9
 
     10     
 
15
 
      6