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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, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | $ 41,278 | $ 39,350
Financial liabilities | 20,570 | 17,276
Recurring Fair Value Measurement |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,550 | 1,566
Financial liabilities | 93 | 49
Recurring Fair Value Measurement | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 465 | 1,034
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,045 | 494
Financial liabilities | 93 | 49
Recurring Fair Value Measurement | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 40 | 38
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Cash equivalents |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 313 | 877
Recurring Fair Value Measurement | Cash equivalents | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 313 | 877
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 | 102 | 89
Recurring Fair Value Measurement | Marketable equity securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 64 | 53
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 | 38 | 36
Recurring Fair Value Measurement | Debt securities |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 90 | 106
Recurring Fair Value Measurement | Debt securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 88 | 104
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 | 2
Recurring Fair Value Measurement | Settlement receivables |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 949 | 465
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 | 949 | 465
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 | 96 | 29
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 | 96 | 29
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] |  |
Financial liabilities | 32 | 33
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial 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] |  |
Financial liabilities | 32 | 33
Recurring Fair Value Measurement | Derivative instruments and embedded derivatives | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Settlement payables |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial liabilities | 61 | 16
Recurring Fair Value Measurement | Settlement payables | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Settlement payables | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial liabilities | 61 | 16
Recurring Fair Value Measurement | Settlement payables | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial liabilities | $ 0 | $ 0

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