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Supplementary Information To Consolidated Statements Of Cash Flows (Details) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable	CAD (104)	CAD (19)
Increase (Decrease) in Income Taxes Receivable	(23)	(22)
Increase (Decrease) in Inventories	88	(2)
Increase (Decrease) in Other Current Assets	(18)	9
Increase (Decrease) in Accounts Payable	162	(45)
Increase (Decrease) in Income Taxes Payable	14	(32)
Increase (Decrease) in Other Current Liabilities	15	9
Increase (Decrease) in Operating Capital, Total	(134)	102
Interest Paid	480	196
Income Taxes Paid, Net	57	124
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Stock Issued During Period, Value, Dividend Reinvestment Plan	103	78
Debt Instrument, Convertible, Beneficial Conversion Feature	CAD 43	CAD 0

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Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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-SubTopic 10
-Section 50
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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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Amount of increase (decrease) in current assets classified as other.

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Amount of increase (decrease) in current liabilities classified as other.

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The amount of cash paid for interest during the period.

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Value of stock issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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