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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity [Abstract] |
Change in Accumulated Other Comprehensive Income by Category |
($ millions) | Opening Balance |  | Net Change |  | Ending Balance
2024 |  |  |  |  |
Unrealized foreign currency translation gains (losses) |  |  |  |  |
Net investments in foreign operations | 1,059 |  |  | 1,653 |  |  | 2,712 |
Hedges of net investments in foreign operations | (452) |  |  | (262) |  |  | (714) |
Income tax recovery | 4 |  |  | 14 |  |  | 18 |
| 611 |  |  | 1,405 |  |  | 2,016 |
Other |  |  |  |  |
Interest rate hedges (Note 26) | 62 |  |  | 10 |  |  | 72 |
Unrealized employee future benefits (losses) gains (Note 24) | (9) |  |  | 2 |  |  | (7) |
Income tax expense | (11) |  |  | (3) |  |  | (14) |
| 42 |  |  | 9 |  |  | 51 |
Accumulated other comprehensive income | 653 |  |  | 1,414 |  |  | 2,067 |
2023 |  |  |  |  |
Unrealized foreign currency translation gains (losses) |  |  |  |  |
Net investments in foreign operations | 1,495 |  |  | (436) |  |  | 1,059 |
Hedges of net investments in foreign operations | (530) |  |  | 78 |  |  | (452) |
Income tax recovery (expense) | 7 |  |  | (3) |  |  | 4 |
| 972 |  |  | (361) |  |  | 611 |
Other |  |  |  |  |
Interest rate hedges (Note 26) | 49 |  |  | 13 |  |  | 62 |
Unrealized employee future benefits losses (Note 24) | (6) |  |  | (3) |  |  | (9) |
Income tax expense | (7) |  |  | (4) |  |  | (11) |
| 36 |  |  | 6 |  |  | 42 |
Accumulated other comprehensive income | 1,008 |  |  | (355) |  |  | 653 |

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