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Other comprehensive income (loss) information
 12 Months Ended
Dec. 31, 2019
Other comprehensive income (loss) information
 
Changes in accumulated other comprehensive income (loss):
                         
millions of Canadian dollars
  
2019
 
 
        2018
 
 
        2017
 
Balance at January 1
 
 
(1,517
) 
 
  
(1,815
 )
 
 
  
(1,897
 )
Postretirement benefits liability adjustment:
 
 
 
    
     
 
Current period change excluding amounts reclassified from accumulated other
 
comprehensive income
 
 
(505
) 
    
158
     
(54
 )
Amounts reclassified from accumulated other comprehensive income
 
 
111
 
    
140
     
136
 
Balance at December 31
 
 
(1,911
) 
    
(1,517
 )
 
    
(1,815
 )
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts reclassified out of accumulated other comprehensive income (loss) -
before-tax
income (expense):
millions of Canadian dollars
   
2019
           2018             2017  
Amortization of postretirement benefits liability adjustment included in net periodic benefit cost
(a)
 
 
(148
)
 
 
(185
)
 
 
(194
)
 
(a)
This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (note 5)
.
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income tax expense (credit) for components of other comprehensive income (loss):
 
 
millions of Canadian dollars
   
2019
         
 
  2018		             2017  
Postretirement benefits liability adjustments:
 
 
 
 
 
 
 
 
 
Postretirement benefits liability adjustment (excluding amortization)
 
 
(165
)
 
 
59
 
 
 
(20
)
Amortization of postretirement benefits liability adjustment included in net periodic benefit cost
 
 
37
 
 
 
45
 
 
 
58
 
Total
 
 
(128
)
 
 
104
 
 
 
38