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Segmented Information (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Capital Expenditures | $ 2,147 | $ 2,303 | $ 2,744
Operating Segments [Member] | USA Operations [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Capital Expenditures | 1,537 | 1,868 | 2,189
Operating Segments [Member] | Canadian Operations [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Capital Expenditures | 606 | 428 | 549
Corporate & Other [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Capital Expenditures | $ 4 | $ 7 | $ 6

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