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Changes in Accumulated Other Comprehensive Loss ("AOCL") by Component (Tables)
 3 Months Ended
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in Accumulated Other Comprehensive Loss (AOCL) by Component
 
For the three months ended March 31
(in millions of Canadian dollars)
Foreign currency net of hedging activities(1)
Derivatives and
other(1)
Pension and post-
retirement defined
benefit plans(1)
Total(1)
Opening balance, January 1, 2018
$
109

$
(89
)
$
(1,761
)
$
(1,741
)
Other comprehensive income before reclassifications
—

13

(1
)
12

Amounts reclassified from accumulated other comprehensive loss
—

2

22

24

Net current-period other comprehensive income
—

15

21

36

Closing balance, March 31, 2018
$
109

$
(74
)
$
(1,740
)
$
(1,705
)
Opening balance, January 1, 2017
$
127

$
(104
)
$
(1,822
)
$
(1,799
)
Other comprehensive (loss) income before reclassifications
(2
)
2

—

—

Amounts reclassified from accumulated other comprehensive loss
—

2

28

30

Net current-period other comprehensive (loss) income
(2
)
4

28

30

Closing balance, March 31, 2017
$
125

$
(100
)
$
(1,794
)
$
(1,769
)
(1) Amounts are presented net of tax.
Amounts in Pension and Post-retirement Defined Benefit Plans Reclassified from AOCL Amounts in Pension and post-retirement defined benefit plans reclassified from AOCL are as follows:
 
For the three months ended March 31
(in millions of Canadian dollars)
2018
 
2017
Amortization of prior service costs(1)
$
(1
)
 
$
(1
)
Recognition of net actuarial loss(1)
30

 
39

Total before income tax
29

 
38

Income tax recovery
(7
)
 
(10
)
Net of income tax
$
22

 
$
28

(1) Impacts Other components of net periodic benefit recovery on the Interim Consolidated Statements of Income.