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Fair Value Measurements (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | $ 56,193 | $ 52,359
Financial liabilities | 27,901 | 25,848
Recurring Fair Value Measurement |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 2,104 | 3,194
Financial liabilities | 184 | 194
Recurring Fair Value Measurement | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 608 | 1,852
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Level 2 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,346 | 1,192
Financial liabilities | 184 | 194
Recurring Fair Value Measurement | Level 3 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 150 | 150
Financial liabilities | 0 | 0
Recurring Fair Value Measurement | Cash equivalents |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 345 | 1,624
Recurring Fair Value Measurement | Cash equivalents | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 345 | 1,624
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 | 229 | 219
Recurring Fair Value Measurement | Marketable and other equity securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 79 | 69
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 | 150
Recurring Fair Value Measurement | Debt securities |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 184 | 159
Recurring Fair Value Measurement | Debt securities | Level 1 |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 184 | 159
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 | 0
Recurring Fair Value Measurement | Settlement receivables |  |
Disclosure of fair value measurement of liabilities and assets [line items] |  |
Financial assets | 1,254 | 1,118
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 | 1,254 | 1,118
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 | 92 | 74
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 | 92 | 74
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 | 148 | 149
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 | 148 | 149
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 | 36 | 45
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 | 36 | 45
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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