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Supplementary Information To Consolidated Statements Of Cash Flows (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable	$ (176)	$ (104)
Increase (Decrease) in Income Taxes Receivable	8	(23)
Increase (Decrease) in Inventories	31	88
Increase (Decrease) in Other Current Assets	14	(18)
Increase (Decrease) in Accounts Payable	3	162
Increase (Decrease) in Income Taxes Payable	(17)	14
Increase (Decrease) in Other Current Liabilities	33	15
Increase (Decrease) in Operating Capital, Total	104	(134)
Interest Paid	689	480
Income Taxes Paid, Net	63	57
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Stock Issued During Period, Value, Dividend Reinvestment Plan	166	103
Debt Instrument, Convertible, Beneficial Conversion Feature	$ 0	$ 43

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

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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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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