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Revenue Contract Balances (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 CAD ($)
Changes in Contract Liabilities [Roll Forward]
Dec. 31, 2017	$ 62
Consideration received	10
Dec. 31, 2018	87
IFRS 15
Changes in Contract Liabilities [Roll Forward]
Dec. 31, 2017	62
IFRS 15 transition adjustment	17
Amounts transferred to revenue included in opening balance	(10)
Consideration received	13
Increases due to interest accrued and expensed during the period	6
Amounts transferred to payables	(1)
Dec. 31, 2018	$ 87

X

- Definition

The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2017-01-01
-Paragraph 40
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_40_a&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 15
-IssueDate 2017-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_105&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
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-IssueDate 2017-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_116_a&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue arising from a change in an estimate of the transaction price. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Increase (decrease) through cumulative catch-up adjustments to revenue, contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Effective 2018-01-01
-Name IFRS
-Number 15
-IssueDate 2017-01-01
-Paragraph 118
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_118_b&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
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-IssueDate 2017-01-01
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-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_116_b&doctype=Standard
-URIDate 2017-03-09

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- Definition

Changes in Contract Liabilities [Roll Forward]

+ References

No definition available.

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- Definition

Increase (Decrease) Due To Interest Accrued And Expensed During Period, Contract Liabilities

+ References

No definition available.

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X

- Definition

Transfers To Payables, Contract Liabilities

+ References

No definition available.

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