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EARNINGS PER COMMON SHARE - DILUTED (Details) - CAD / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Weighted average number of common shares outstanding diluted
Weighted average common shares outstanding	1,628,000,000	917,000,000	1,404,000,000	897,000,000
Effect of dilutive options (in shares)	8,000,000	8,000,000	9,000,000	7,000,000
Diluted weighted average common shares outstanding	1,636,000,000	925,000,000	1,413,000,000	904,000,000
Stock options
Weighted average number of common shares outstanding diluted
Antidilutive securities excluded from the diluted earnings per common share calculation (in shares)	13,416,763	7,802,601	13,480,978	13,976,687
Weighted average exercise price of antidilutive securities (in Canadian dollars per share)	CAD 57.98	CAD 55.77	CAD 57.84	CAD 51.34

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- Definition

Represents the weighted average exercise price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

No definition available.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6510752

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6508534

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-Name Accounting Standards Codification
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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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