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Commitments - Other Commitments (Details) CAD in Millions | 12 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD | Dec. 31, 2021 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2014 USD ($) project
Other Commitments [Line Items] |  |  |  |  |  |  |
Gross capital expenditures |  | CAD 2,061 | CAD 2,243 |  |  |  |
Regulatory liability |  |  | CAD 1,638 |  |  | CAD 2,183 |
CH Energy Group |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Number of high-voltage transmission projects | project |  |  |  |  |  |  | 5
Investment in electric transmission projects | $ |  |  |  |  |  |  | $ 1,700,000,000
CH Energy Group | Payment guarantee |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value | $ |  |  |  |  | $ 0 |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ |  |  |  |  |  |  | $ 182,000,000
Parental guarantee | FHI | Payment guarantee |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  |  | CAD 77 |
Forecast |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Gross capital expenditures | CAD 3,000 |  |  | CAD 13,000 |  |  |

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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