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Employee Future Benefits - Schedule of Allocation of Plan Assets (Details) - CAD CAD in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
2016 Target Allocation (percent) | 100.00% |  |
Actual Plan Asset Allocations (percent) | 100.00% | 100.00% |
Fair value of plan assets | CAD 2,898 | CAD 2,647 |
Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
2016 Target Allocation (percent) | 50.00% |  |
Actual Plan Asset Allocations (percent) | 50.00% | 51.00% |
Fair value of plan assets | CAD 1,449 | CAD 1,339 |
Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
2016 Target Allocation (percent) | 46.00% |  |
Actual Plan Asset Allocations (percent) | 45.00% | 44.00% |
Fair value of plan assets | CAD 1,304 | CAD 1,166 |
Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
2016 Target Allocation (percent) | 4.00% |  |
Actual Plan Asset Allocations (percent) | 4.00% | 4.00% |
Fair value of plan assets | CAD 116 | CAD 111 |
Private equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | CAD 10 | CAD 10 |
Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
2016 Target Allocation (percent) | 0.00% |  |
Actual Plan Asset Allocations (percent) | 1.00% | 1.00% |
Fair value of plan assets | CAD 19 | CAD 21 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 637 | 420 |
Level 1 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 507 | 417 |
Level 1 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 124 | 0 |
Level 1 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Private equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6 | 3 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,148 | 2,120 |
Level 2 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 942 | 922 |
Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,180 | 1,166 |
Level 2 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 13 | 14 |
Level 2 | Private equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 13 | 18 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 113 | 107 | CAD 93
Level 3 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 103 | 97 |
Level 3 | Private equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10 | 10 |
Level 3 | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | CAD 0 | CAD 0 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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