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Accumulated Other Comprehensive loss (Tables)

12 Months Ended

Dec. 31, 2017

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

Components of Accumulated other comprehensive loss

In millions					Foreign currency translation adjustments		Pension and other postretirement benefit plans			Total before tax			Income tax recovery (expense)			Total net of tax
Balance at December 31, 2014				$	(451)	$	(2,510)		$	(2,961)		$	534		$	(2,427)
Other comprehensive income (loss)
	before reclassifications:
	Foreign exchange gain on translation of net
		investment in foreign operations			1,607					1,607			-			1,607
	Foreign exchange loss on translation of
		US dollar-denominated debt designated
		as a hedge of the net investment in
		foreign operations			(1,358)					(1,358)			181			(1,177)
	Actuarial gain arising during the year						74			74			(18)			56
	Prior service cost from plan
		amendment arising during the year					(1)			(1)			-			(1)
Amounts reclassified from Accumulated
	other comprehensive loss:
	Amortization of net actuarial loss						224			224	⁽¹⁾		(56)	⁽²⁾		168
	Amortization of prior service costs						5			5	⁽¹⁾		(1)	⁽²⁾		4
	Settlement loss arising during the year						4			4	⁽¹⁾		(1)	⁽²⁾		3
Other comprehensive income					249		306			555			105			660
Balance at December 31, 2015				$	(202)	$	(2,204)		$	(2,406)		$	639		$	(1,767)
Other comprehensive income (loss)
	before reclassifications:
	Foreign exchange loss on translation of net
		investment in foreign operations			(310)					(310)			-			(310)
	Foreign exchange gain on translation of
		US dollar-denominated debt designated
		as a hedge of the net investment in
		foreign operations			265					265			(35)			230
	Actuarial loss arising during the year						(881)			(881)			235			(646)
Amounts reclassified from Accumulated
	other comprehensive loss:
	Amortization of net actuarial loss						172			172	⁽¹⁾		(47)	⁽²⁾		125
	Amortization of prior service costs						5			5	⁽¹⁾		(1)	⁽²⁾		4
	Settlement loss arising during the year						10			10	⁽¹⁾		(4)	⁽²⁾		6
Other comprehensive income (loss)					(45)		(694)			(739)			148			(591)
Balance at December 31, 2016				$	(247)	$	(2,898)		$	(3,145)		$	787		$	(2,358)

(1)		Reclassified to Labor and fringe benefits in the Consolidated Statements of Income and included in components of net periodic benefit cost. See Note 12 - Pensions and other postretirement benefits.
(2)		Included in Income tax recovery (expense) in the Consolidated Statements of Income.

In millions					Foreign currency translation adjustments		Pension and other postretirement benefit plans			Total before tax			Income tax recovery (expense)			Total net of tax
Balance at December 31, 2016				$	(247)	$	(2,898)		$	(3,145)		$	787		$	(2,358)
Other comprehensive income (loss)
	before reclassifications:
	Foreign exchange loss on translation of net
		investment in foreign operations			(701)					(701)			-			(701)
	Foreign exchange gain on translation of
		US dollar-denominated debt designated
		as a hedge of the net investment in
		foreign operations			504					504			(67)			437
	Actuarial loss arising during the year						(408)			(408)			110			(298)
Amounts reclassified from Accumulated
	other comprehensive loss:
	Amortization of net actuarial loss						179			179	⁽¹⁾		(47)	⁽²⁾		132
	Amortization of prior service costs						5			5	⁽¹⁾		(1)	⁽²⁾		4
Other comprehensive loss					(197)		(224)			(421)			(5)			(426)
Balance at December 31, 2017				$	(444)	$	(3,122)		$	(3,566)		$	782		$	(2,784)

(1)		Reclassified to Labor and fringe benefits in the Consolidated Statements of Income and included in components of net periodic benefit cost. See Note 12 - Pensions and other postretirement benefits.
(2)		Included in Income tax recovery (expense) in the Consolidated Statements of Income.