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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, 2021 | Dec. 31, 2020
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Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | $ 47,368 | $ 41,278
Financial liabilities | 23,595 | 20,570
Recurring Fair Value Measurement |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 2,187 | 1,550
Financial liabilities | 197 | 93
Recurring Fair Value Measurement | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 935 | 465
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,204 | 1,045
Financial liabilities | 197 | 93
Recurring Fair Value Measurement | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 48 | 40
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Cash equivalents |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 790 | 313
Recurring Fair Value Measurement | Cash equivalents | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 790 | 313
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 | 88 | 102
Recurring Fair Value Measurement | Marketable equity securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 41 | 64
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 | 47 | 38
Recurring Fair Value Measurement | Debt securities |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 105 | 90
Recurring Fair Value Measurement | Debt securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 104 | 88
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 | 1 | 2
Recurring Fair Value Measurement | Settlement receivables |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,126 | 949
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 | 1,126 | 949
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 | 78 | 96
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 | 78 | 96
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 | 158 | 32
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 | 158 | 32
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 | 39 | 61
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 | 39 | 61
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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