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Changes in Accumulated Other Comprehensive Loss ("AOCL") by Component
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Loss (AOCL) by Component
Changes in accumulated other comprehensive loss ("AOCL") by component
 
For the three months ended June 30
(in millions of Canadian dollars, net of tax)
Foreign currency
net of hedging
activities
Derivatives and other
Pension and post-retirement defined benefit plans
Total
Opening balance, April 1, 2017
$
125

$
(100
)
$
(1,794
)
$
(1,769
)
Other comprehensive (loss) income before reclassifications
(1
)
(9
)
—

(10
)
Amounts reclassified from accumulated other comprehensive loss
—

12

27

39

Net current-period other comprehensive (loss) income
(1
)
3

27

29

Closing balance, June 30, 2017
$
124

$
(97
)
$
(1,767
)
$
(1,740
)
Opening balance, April 1, 2016
$
125

$
(136
)
$
(1,470
)
$
(1,481
)
Other comprehensive loss before reclassifications
(1
)
(23
)
(2
)
(26
)
Amounts reclassified from accumulated other comprehensive loss
—

2

34

36

Net current-period other comprehensive (loss) income
(1
)
(21
)
32

10

Closing balance, June 30, 2016
$
124

$
(157
)
$
(1,438
)
$
(1,471
)
 
For the six months ended June 30
(in millions of Canadian dollars, net of tax)
Foreign currency
net of hedging
activities
Derivatives and other
Pension and post-retirement defined benefit plans
Total
Opening balance, January 1, 2017
$
127

$
(104
)
$
(1,822
)
$
(1,799
)
Other comprehensive (loss) income before reclassifications
(3
)
(7
)
—

(10
)
Amounts reclassified from accumulated other comprehensive loss
—

14

55

69

Net current-period other comprehensive (loss) income
(3
)
7

55

59

Closing balance, June 30, 2017
$
124

$
(97
)
$
(1,767
)
$
(1,740
)
Opening balance, January 1, 2016
$
129

$
(102
)
$
(1,504
)
$
(1,477
)
Other comprehensive loss before reclassifications
(5
)
(59
)
(2
)
(66
)
Amounts reclassified from accumulated other comprehensive loss
—

4

68

72

Net current-period other comprehensive (loss) income
(5
)
(55
)
66

6

Closing balance, June 30, 2016
$
124

$
(157
)
$
(1,438
)
$
(1,471
)



Amounts in Pension and post-retirement defined benefit plans reclassified from AOCL:

For the three months ended June 30
 
For the six months ended June 30
(in millions of Canadian dollars)
2017
 
2016
 
2017
 
2016
Amortization of prior service costs(1)
$
(1
)
 
$
(1
)
 
$
(2
)
 
$
(3
)
Recognition of net actuarial loss(1)
38

 
48

 
77

 
97

Total before income tax
37

 
47

 
75

 
94

Income tax recovery
(10
)
 
(13
)
 
(20
)
 
(26
)
Net of income tax
$
27

 
$
34

 
$
55

 
$
68

(1) Impacts "Compensation and benefits" on the Interim Consolidated Statements of Income.