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Changes in Accumulated Other Comprehensive Loss ("AOCL") by Component (Tables)
 9 Months Ended
Sep. 30, 2017
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, net of tax)
Foreign currency
net of hedging
activities
Derivatives and other
Pension and post-retirement defined benefit plans
Total
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 current-period other comprehensive (loss) income
(5
)
2

28

25

Closing balance, September 30, 2017
$
119

$
(95
)
$
(1,739
)
$
(1,715
)
Opening balance, July 1, 2016
$
124

$
(157
)
$
(1,438
)
$
(1,471
)
Other comprehensive income (loss) before reclassifications
2

(1
)
1

2

Amounts reclassified from accumulated other comprehensive loss
—

2

34

36

Net current-period other comprehensive income
2

1

35

38

Closing balance, September 30, 2016
$
126

$
(156
)
$
(1,403
)
$
(1,433
)
 
For the nine months ended September 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 before reclassifications
(8
)
(7
)
—

(15
)
Amounts reclassified from accumulated other comprehensive loss
—

16

83

99

Net current-period other comprehensive (loss) income
(8
)
9

83

84

Closing balance, September 30, 2017
$
119

$
(95
)
$
(1,739
)
$
(1,715
)
Opening balance, January 1, 2016
$
129

$
(102
)
$
(1,504
)
$
(1,477
)
Other comprehensive loss before reclassifications
(3
)
(60
)
(1
)
(64
)
Amounts reclassified from accumulated other comprehensive loss
—

6

102

108

Net current-period other comprehensive (loss) income
(3
)
(54
)
101

44

Closing balance, September 30, 2016
$
126

$
(156
)
$
(1,403
)
$
(1,433
)
Amounts in Pension and Post-retirement Defined Benefit Plans Reclassified from AOCL Amounts in Pension and post-retirement defined benefit plans reclassified from AOCL:

For the three months ended September 30
 
For the nine months ended September 30
(in millions of Canadian dollars)
2017
 
2016
 
2017
 
2016
Amortization of prior service costs(1)
$
(1
)
 
$
(2
)
 
$
(3
)
 
$
(5
)
Recognition of net actuarial loss(1)
39

 
49

 
116

 
146

Total before income tax
38

 
47

 
113

 
141

Income tax recovery
(10
)
 
(13
)
 
(30
)
 
(39
)
Net of income tax
$
28

 
$
34

 
$
83

 
$
102

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