Changes in Accumulated Other Comprehensive Loss ("AOCL") by Component (Tables)

9 Months Ended

Sep. 30, 2021

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Changes in Accumulated Other Comprehensive Income Loss 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, 2021	$	110	$	(101)	$	(2,800)	$	(2,791)
Other comprehensive income before reclassifications	6		101		—		107
Amounts reclassified from accumulated other comprehensive loss	—		2		39		41
Net other comprehensive income	6		103		39		148
Closing balance, September 30, 2021	$	116	$	2	$	(2,761)	$	(2,643)
Opening balance, July 1, 2020	$	116	$	(52)	$	(2,514)	$	(2,450)
Other comprehensive loss before reclassifications	(1)		—		—		(1)
Amounts reclassified from accumulated other comprehensive loss	—		2		33		35
Net other comprehensive (loss) income	(1)		2		33		34
Closing balance, September 30, 2020	$	115	$	(50)	$	(2,481)	$	(2,416)

(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, 2021	$	112	$	(48)	$	(2,878)	$	(2,814)
Other comprehensive income before reclassifications	4		44		—		48
Amounts reclassified from accumulated other comprehensive loss	—		6		117		123
Net other comprehensive income	4		50		117		171
Closing balance, September 30, 2021	$	116	$	2	$	(2,761)	$	(2,643)
Opening balance, January 1, 2020	$	112	$	(54)	$	(2,580)	$	(2,522)
Other comprehensive income (loss) before reclassifications	3		(2)		—		1
Amounts reclassified from accumulated other comprehensive loss	—		6		99		105
Net other comprehensive income	3		4		99		106
Closing balance, September 30, 2020	$	115	$	(50)	$	(2,481)	$	(2,416)

(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)	2021		2020		2021		2020
Amortization of prior service costs(1)	$	—	$	(1)	$	—	$	(1)
Recognition of net actuarial loss(1)	53		45		158		135
Total before income tax	53		44		158		134
Income tax recovery	(14)		(11)		(41)		(35)
Total net of income tax	$	39	$	33	$	117	$	99

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