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Fair Value Measurements - Summary of Fair Values of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | $ 17,276 | $ 16,608
Financial assets | 39,350 | 39,626
Recurring Fair Value Measurement |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 49 | 90
Financial assets | 1,566 | 2,112
Recurring Fair Value Measurement | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 0 | 0
Financial assets | 1,034 | 1,430
Recurring Fair Value Measurement | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 49 | 90
Financial assets | 494 | 643
Recurring Fair Value Measurement | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 0 | 0
Financial assets | 38 | 39
Recurring Fair Value Measurement | Cash equivalents |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 877 | 1,296
Recurring Fair Value Measurement | Cash equivalents | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 877 | 1,296
Recurring Fair Value Measurement | Cash equivalents | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Cash equivalents | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Marketable equity securities |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 89 | 80
Recurring Fair Value Measurement | Marketable equity securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 53 | 44
Recurring Fair Value Measurement | Marketable equity securities | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Marketable equity securities | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 36 | 36
Recurring Fair Value Measurement | Debt securities |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 106 | 93
Recurring Fair Value Measurement | Debt securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 104 | 90
Recurring Fair Value Measurement | Debt securities | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Debt securities | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 2 | 3
Recurring Fair Value Measurement | Settlement receivables |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 465 | 557
Recurring Fair Value Measurement | Settlement receivables | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Settlement receivables | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 465 | 557
Recurring Fair Value Measurement | Settlement receivables | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 29 | 86
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 29 | 86
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 33 | 45
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 0 | 0
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 33 | 45
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 0 | 0
Recurring Fair Value Measurement | Settlement payables |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 16 | 45
Recurring Fair Value Measurement | Settlement payables | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 0 | 0
Recurring Fair Value Measurement | Settlement payables | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | 16 | 45
Recurring Fair Value Measurement | Settlement payables | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Liabilities | $ 0 | $ 0

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