Major Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Loss Contingencies [Line Items]

Minimum rental payments for operating leases and minimum lease payments for capital leases in each of the next five years and thereafter

In millions			Operating		Capital
2018		$	139	$	52
2019			109		17
2020			77		21
2021			59		12
2022			38		7
2023 and thereafter			139		132
Total		$	561		241
Less:	Imputed interest on capital leases at rates ranging from approximately 1.0% to 6.8%				83
Present value of minimum lease payments included in debt (Note 10)				$	158

Provision for specific environmental sites

In millions		2017		2016		2015
Beginning of year	$	86	$	110	$	114
Accruals and other		16		6		81
Payments		(23)		(29)		(91)
Foreign exchange		(1)		(1)		6
End of year	$	78	$	86	$	110
Current portion - End of year	$	57	$	50	$	51

Employee injuries, Canada

Loss Contingencies [Line Items]

Provision for personal injury and other claims

In millions		2017		2016		2015
Beginning of year	$	183	$	191	$	203
Accruals and other		38		24		17
Payments		(38)		(32)		(29)
End of year	$	183	$	183	$	191
Current portion - End of year	$	40	$	39	$	27

Employee injuries, United States

Loss Contingencies [Line Items]

Provision for personal injury and other claims

In millions		2017		2016		2015
Beginning of year	$	118	$	105	$	95
Accruals and other		46		51		22
Payments		(41)		(34)		(30)
Foreign exchange		(7)		(4)		18
End of year	$	116	$	118	$	105
Current portion - End of year	$	25	$	37	$	24