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Changes in Accumulated Other Comprehensive Loss ("AOCL") by Component (Tables)
 3 Months Ended
Mar. 31, 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 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, 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
)
Opening balance, January 1, 2016
$
129

$
(102
)
$
(1,504
)
$
(1,477
)
Other comprehensive (loss) income before reclassifications
(4
)
(36
)
—

(40
)
Amounts reclassified from accumulated other comprehensive loss
—

2

34

36

Net current-period other comprehensive (loss) income
(4
)
(34
)
34

(4
)
Closing balance, March 31, 2016
$
125

$
(136
)
$
(1,470
)
$
(1,481
)
(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

For the three months ended March 31
(in millions of Canadian dollars)
2017
2016
Amortization of prior service costs(1)
$
(1
)
$
(2
)
Recognition of net actuarial loss(1)
39

49

Total before income tax
38

47

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

$
34

(1) Impacts Compensation and benefits on the interim consolidated statements of income.