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ACQUISITION AND DISPOSITIONS - DISPOSITIONS (Details) CAD in Millions, $ in Millions			3 Months Ended		6 Months Ended
	Mar. 01, 2017 USD ($)	Mar. 01, 2017 CAD	Jun. 30, 2017 USD ($)	Jun. 30, 2017 CAD	Jun. 30, 2017 CAD
DISPOSITIONS
Gain on disposal				CAD 69	CAD 83
Disposed of by sale, not discontinued operations | Sandpiper Project
DISPOSITIONS
Cash proceeds			$ 97	130
Gain on disposal			$ 52	CAD 69
Disposed of by sale, not discontinued operations | Assets of Ozark Pipeline
DISPOSITIONS
Cash proceeds	$ 219	CAD 294
Gain on disposal	$ 10	CAD 14

X

- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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