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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Fair Values of Financial Assets Measured at Fair Value on Recurring Basis | The fair values of our financial assets and liabilities measured at fair value on a recurring basis at December 31, 2018 and 2017, are summarized in the following table:
(CAD$ in millions) |  | 2018 |  |  | 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 68 |  |  | $ | — |  |  | $ | — |  |  | $ | 68 |  |  | $ | 722 |  |  | $ | — |  |  | $ | — |  |  | $ | 722 |
Marketable equity securities |  |  | 44 |  |  |  | — |  |  |  | 36 |  |  |  | 80 |  |  |  | 124 |  |  |  | — |  |  |  | — |  |  |  | 124 |
Debt securities |  |  | 90 |  |  |  | — |  |  |  | 3 |  |  |  | 93 |  |  |  | 37 |  |  |  | — |  |  |  | 4 |  |  |  | 41 |
Settlement receivables |  |  | — |  |  |  | 557 |  |  |  | — |  |  |  | 557 |  |  |  | — |  |  |  | 687 |  |  |  | — |  |  |  | 687 |
Derivative instruments and embedded derivatives |  |  | — |  |  |  | 86 |  |  |  | — |  |  |  | 86 |  |  |  | — |  |  |  | 126 |  |  |  | — |  |  |  | 126 |
|  | $ | 202 |  |  | $ | 643 |  |  | $ | 39 |  |  | $ | 884 |  |  | $ | 883 |  |  | $ | 813 |  |  | $ | 4 |  |  | $ | 1,700 |
Summary of Fair Values of Financial Liabilities Measured at Fair Value on Recurring Basis |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments and embedded derivatives |  | $ | — |  |  | $ | 45 |  |  | $ | — |  |  | $ | 45 |  |  | $ | — |  |  | $ | 43 |  |  | $ | — |  |  | $ | 43 |
Settlement payables |  |  | — |  |  |  | 45 |  |  |  | — |  |  |  | 45 |  |  |  | — |  |  |  | 39 |  |  |  | — |  |  |  | 39 |
|  | $ | — |  |  | $ | 90 |  |  | $ | — |  |  | $ | 90 |  |  | $ | — |  |  | $ | 82 |  |  | $ | — |  |  | $ | 82 |

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- Definition The disclosure of the fair value measurement of assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The disclosure of the fair value measurement of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93&doctype=Standard -URIDate 2018-03-16 + Details
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