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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair Value Measurement [Abstract] |
Summary of Fair Values of Financial Assets Measured at Fair Value on Recurring Basis | The fair values of our financial assets and liabilities measured at fair value on a recurring basis at December 31, 2024 and 2023, are summarized in the following table:
(CAD$ in millions) |  | 2024 |  | 2023
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 5,244 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,244 |  |  | $ | 345 |  |  | $ | — |  |  | $ | — |  |  | $ | 345 |
Marketable and other equity securities |  | 118 |  |  | — |  |  | 189 |  |  | 307 |  |  | 79 |  |  | — |  |  | 150 |  |  | 229 |
Debt securities |  | 220 |  |  | — |  |  | — |  |  | 220 |  |  | 184 |  |  | — |  |  | — |  |  | 184 |
Settlement receivables |  | — |  |  | 1,456 |  |  | — |  |  | 1,456 |  |  | — |  |  | 1,254 |  |  | — |  |  | 1,254 |
Derivative instruments and embedded derivatives |  | — |  |  | 168 |  |  | — |  |  | 168 |  |  | — |  |  | 92 |  |  | — |  |  | 92 |
|  | $ | 5,582 |  |  | $ | 1,624 |  |  | $ | 189 |  |  | $ | 7,395 |  |  | $ | 608 |  |  | $ | 1,346 |  |  | $ | 150 |  |  | $ | 2,104 |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments and embedded derivatives |  | $ | — |  |  | $ | 179 |  |  | $ | — |  |  | $ | 179 |  |  | $ | — |  |  | $ | 148 |  |  | $ | — |  |  | $ | 148 |
Settlement payables |  | — |  |  | 70 |  |  | — |  |  | 70 |  |  | — |  |  | 36 |  |  | — |  |  | 36 |
|  | $ | — |  |  | $ | 249 |  |  | $ | — |  |  | $ | 249 |  |  | $ | — |  |  | $ | 184 |  |  | $ | — |  |  | $ | 184 |
Summary of Fair Values of Financial Liabilities Measured at Fair Value on Recurring Basis | The fair values of our financial assets and liabilities measured at fair value on a recurring basis at December 31, 2024 and 2023, are summarized in the following table:
(CAD$ in millions) |  | 2024 |  | 2023
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 5,244 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,244 |  |  | $ | 345 |  |  | $ | — |  |  | $ | — |  |  | $ | 345 |
Marketable and other equity securities |  | 118 |  |  | — |  |  | 189 |  |  | 307 |  |  | 79 |  |  | — |  |  | 150 |  |  | 229 |
Debt securities |  | 220 |  |  | — |  |  | — |  |  | 220 |  |  | 184 |  |  | — |  |  | — |  |  | 184 |
Settlement receivables |  | — |  |  | 1,456 |  |  | — |  |  | 1,456 |  |  | — |  |  | 1,254 |  |  | — |  |  | 1,254 |
Derivative instruments and embedded derivatives |  | — |  |  | 168 |  |  | — |  |  | 168 |  |  | — |  |  | 92 |  |  | — |  |  | 92 |
|  | $ | 5,582 |  |  | $ | 1,624 |  |  | $ | 189 |  |  | $ | 7,395 |  |  | $ | 608 |  |  | $ | 1,346 |  |  | $ | 150 |  |  | $ | 2,104 |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments and embedded derivatives |  | $ | — |  |  | $ | 179 |  |  | $ | — |  |  | $ | 179 |  |  | $ | — |  |  | $ | 148 |  |  | $ | — |  |  | $ | 148 |
Settlement payables |  | — |  |  | 70 |  |  | — |  |  | 70 |  |  | — |  |  | 36 |  |  | — |  |  | 36 |
|  | $ | — |  |  | $ | 249 |  |  | $ | — |  |  | $ | 249 |  |  | $ | — |  |  | $ | 184 |  |  | $ | — |  |  | $ | 184 |

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