Schedule II - Valuation and Qualifying Accounts (Details) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accruals for legal, personal injury and casualty-related claims [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance at January 1	CAD 150	CAD 153	CAD 172
Additions charged to expenses	79	32	62
Payments and other reductions	(102)	(38)	(84)
Impact of FX	6	3	3
Ending balance at December 31	133	150	153
Environmental liabilities [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance at January 1	91	90	89
Additions charged to expenses	7	4	6
Payments and other reductions	(17)	(9)	(9)
Impact of FX	12	6	4
Ending balance at December 31	CAD 93	CAD 91	CAD 90

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

+ Details

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

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- Definition

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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