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Financial Instruments And Risk Management - Financial Liabilities (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Derivatives |  |
Financial Liabilities Offsetting |  |
Gross Liabilities | CAD (1,231) | CAD (1,819)
Gross Assets Offset | 1,052 | 1,610
Net Amounts Presented | (179) | (209)
Accounts Payable |  |
Financial Liabilities Offsetting |  |
Gross Liabilities | (2,270) | (1,975)
Gross Assets Offset | 1,252 | 946
Net Amounts Presented | (1,018) | (1,029)
Financial liabilities |  |
Financial Liabilities Offsetting |  |
Gross Liabilities | (3,501) | (3,794)
Gross Assets Offset | 2,304 | 2,556
Net Amounts Presented | CAD (1,197) | CAD (1,238)

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- Definition The amount of financial assets set off against financial liabilities when an entity: (a) currently has a legally enforceable right to set off the recognised amounts; and (b) intends either to settle on a net basis, or to realise the asset and settle the liability simultaneously. [Refer: Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 13C -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_13C_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gross amount of recognised financial liabilities that are subject either to offsetting or to an enforceable master netting arrangement or similar agreement. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 13C -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_13C_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The net amount of financial liabilities that are subject either to offsetting or to an enforceable master netting arrangement or similar agreement, presented in the statement of financial position. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 13C -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_13C_c&doctype=Standard -URIDate 2017-03-09 + Details
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