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v3.25.2

Debt (Details) $ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 CAD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 CAD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 CAD ($) | Jun. 30, 2025 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CAD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commercial paper borrowings |  |  |  |  |  |  | $ 1,102 | $ 1,586
2.90% 10-year Note | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of note |  |  |  | $ 642 | $ 930 |  |  |
Interest rate |  |  |  | 2.90% |  | 2.90% |  |
Note term |  |  |  | 10 years | 10 years |  |  |
4.00% 7-year Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt | $ 498 |  |  |  |  |  |  |
4.00% 7-year Note | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 500 |  |
Interest rate |  |  |  | 4.00% |  | 4.00% |  |
Note term | 7 years |  |  |  |  |  |  |
4.40% 10.5-year Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt | $ 598 |  |  |  |  |  |  |
4.40% 10.5-year Note | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 600 |  |
Interest rate |  |  |  | 4.40% |  | 4.40% |  |
Note term | 10 years 6 months |  |  |  |  |  |  |
4.80% 30-year Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt | $ 296 |  |  |  |  |  |  |
4.80% 30-year Note | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 300 |  |
Interest rate |  |  |  | 4.80% |  | 4.80% |  |
Note term | 30 years |  |  |  |  |  |  |
4.80% 5-year Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt |  |  |  | $ 596 | $ 857 |  |  |
4.80% 5-year Note | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 600 |  |  |  |
Interest rate |  |  |  | 4.80% |  | 4.80% |  |
Note term |  |  |  | 5 years | 5 years |  |  |
5.20% 10-year Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt |  |  |  | $ 593 | $ 853 |  |  |
5.20% 10-year Note | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 600 |  |  |  |
Interest rate |  |  |  | 5.20% |  | 5.20% |  |
Note term |  |  |  | 10 years | 10 years |  |  |
Term Facility | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from term loan |  |  |  | $ 500 |  |  |  |
Repayments of term loan |  |  |  | 500 |  |  |  |
Commercial Paper | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) |  |  |  | 1,500 |  |  |  |
Commercial paper borrowings |  |  |  | $ 250 |  | $ 341 |  |
Weighted average interest rate |  |  |  | 4.69% |  | 4.69% | 4.75% | 4.75%
Third Amended and Restated Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) |  |  |  | $ 2,200 |  |  |  |
5-Year Credit Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Note term |  |  |  | 5 years | 5 years |  |  |
Line of credit facility, current borrowing capacity |  |  |  | $ 1,100 |  |  |  |
2-Year Credit Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Note term |  |  |  | 2 years | 2 years |  |  |
Line of credit facility, current borrowing capacity |  |  |  | $ 1,100 |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 200 | $ 288
Repayments of long-term debt |  | $ 200 | $ 288 |  |  |  |  |

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