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Changes in Accumulated Other Comprehensive Loss ("AOCL") by Component (Tables)
 9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in Accumulated Other Comprehensive Loss (AOCL) by Component
 
For the three months ended September 30
(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, July 1, 2018
$
110

$
(64
)
$
(1,719
)
$
(1,673
)
Other comprehensive (loss) income before reclassifications
(1
)
(2
)
1

(2
)
Amounts reclassified from accumulated other comprehensive loss
—

2

19

21

Net other comprehensive (loss) income
(1
)
—

20

19

Closing balance, September 30, 2018
$
109

$
(64
)
$
(1,699
)
$
(1,654
)
Opening balance, July 1, 2017
$
124

$
(97
)
$
(1,767
)
$
(1,740
)
Other comprehensive loss before reclassifications
(5
)
—

—

(5
)
Amounts reclassified from accumulated other comprehensive loss
—

2

28

30

Net other comprehensive (loss) income
(5
)
2

28

25

Closing balance, September 30, 2017
$
119

$
(95
)
$
(1,739
)
$
(1,715
)
(1) Amounts are presented net of tax.
 
For the nine months ended September 30
(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
—

19

—

19

Amounts reclassified from accumulated other comprehensive loss
—

6

62

68

Net other comprehensive income
—

25

62

87

Closing balance, September 30, 2018
$
109

$
(64
)
$
(1,699
)
$
(1,654
)
Opening balance, January 1, 2017
$
127

$
(104
)
$
(1,822
)
$
(1,799
)
Other comprehensive loss before reclassifications
(8
)
(7
)
—

(15
)
Amounts reclassified from accumulated other comprehensive loss
—

16

83

99

Net other comprehensive (loss) income
(8
)
9

83

84

Closing balance, September 30, 2017
$
119

$
(95
)
$
(1,739
)
$
(1,715
)
(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 September 30
For the nine months ended September 30
(in millions of Canadian dollars)
2018
2017
2018
2017
Amortization of prior service costs(1)
$
(1
)
$
(1
)
$
(2
)
$
(3
)
Recognition of net actuarial loss(1)
29

39

88

116

Total before income tax
28

38

86

113

Income tax recovery
(9
)
(10
)
(24
)
(30
)
Total net of income tax
$
19

$
28

$
62

$
83

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