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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2019
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) (1)

 
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

(2 
) 
(47
)
(3 
) 
132

Amortization of prior service costs
 
 
5

 
5

(2 
) 
(1
)
(3 
) 
4

Other comprehensive loss
(197
)
 
(224
)
 
(421
)
 
(5
)
 
(426
)
Balance at December 31, 2017
(444
)
 
(3,122
)
 
(3,566
)
 
782

 
(2,784
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
 
 
 
 
Foreign exchange gain on translation of net investment in foreign operations
1,038

 
 
 
1,038

 
—

 
1,038

Foreign exchange loss on translation of US dollar-denominated debt designated as a hedge of the net investment in foreign operations
(635
)
 
 
 
(635
)
 
86

 
(549
)
Actuarial loss arising during the year
 
 
(969
)
 
(969
)
 
262

 
(707
)
Prior service credit arising during the year
 
 
6

 
6

 
(2
)
 
4

Amounts reclassified from Accumulated other comprehensive loss:
 
 
 
 
 
 
 
 
 
Amortization of net actuarial loss
 
 
198

 
198

(2 
) 
(54
)
(3 
) 
144

Amortization of prior service costs
 
 
3

 
3

(2 
) 
—

(3 
) 
3

Settlement loss arising during the year
 
 
3

 
3

(2 
) 
(1
)
(3 
) 
2

Other comprehensive income (loss)
403

 
(759
)
 
(356
)
 
291

 
(65
)
Balance at December 31, 2018
(41
)
 
(3,881
)
 
(3,922
)
 
1,073

 
(2,849
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
 
 
 
 
Foreign exchange loss on translation of net investment in foreign operations
(636
)
 
 
 
(636
)
 
—

 
(636
)
Foreign exchange gain on translation of US dollar-denominated debt designated as a hedge of the net investment in foreign operations
380

 
 
 
380

 
(52
)
 
328

Actuarial loss arising during the year
 
 
(600
)
 
(600
)
 
155

 
(445
)
Amounts reclassified from Accumulated other comprehensive loss:
 
 
 
 
 
 
 
 
 
Amortization of net actuarial loss
 
 
152

 
152

(2 
) 
(39
)
(3 
) 
113

Amortization of prior service costs
 
 
3

 
3

(2 
) 
(1
)
(3 
) 
2

Settlement loss arising during the year
 
 
5

 
5

(2 
) 
(1
)
(3 
) 
4

Other comprehensive income (loss)
(256
)
 
(440
)
 
(696
)
 
62

 
(634
)
Balance at December 31, 2019
$
(297
)
 
$
(4,321
)
 
$
(4,618
)
 
$
1,135

 
$
(3,483
)
(1)
The Company releases stranded tax effects from Accumulated other comprehensive loss to Net income upon the liquidation or termination of the related item.
(2)
Reclassified to Other components of net periodic benefit income in the Consolidated Statements of Income and included in net periodic benefit cost. See Note 15 - Pensions and other postretirement benefits.
(3)
Included in Income tax recovery (expense) in the Consolidated Statements of Income.