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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, 2022 | Dec. 31, 2021
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Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | $ 52,359 | $ 47,368
Financial liabilities | 25,848 | 23,595
Recurring Fair Value Measurement |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 3,194 | 2,187
Financial liabilities | 194 | 197
Recurring Fair Value Measurement | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,852 | 935
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,192 | 1,204
Financial liabilities | 194 | 197
Recurring Fair Value Measurement | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 150 | 48
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Cash equivalents |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,624 | 790
Recurring Fair Value Measurement | Cash equivalents | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,624 | 790
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 and other equity securities |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 219 | 88
Recurring Fair Value Measurement | Marketable and other equity securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 69 | 41
Recurring Fair Value Measurement | Marketable and other equity securities | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 0 | 0
Recurring Fair Value Measurement | Marketable and other equity securities | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 150 | 47
Recurring Fair Value Measurement | Debt securities |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 159 | 105
Recurring Fair Value Measurement | Debt securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 159 | 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 | 0 | 1
Recurring Fair Value Measurement | Settlement receivables |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,118 | 1,126
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 | 1,118 | 1,126
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 | 74 | 78
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 | 74 | 78
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 | 149 | 158
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 | 149 | 158
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 | 45 | 39
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 | 45 | 39
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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