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Income Taxes (Net Deferred Income Tax Asset (Liability) by Jurisdiction) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Deferred Income Taxes Assets | $ 744 | $ 10
Deferred Income Tax Liabilities | (402) | (202)
Net Deferred Income Tax Asset | 342 |
Net Deferred Income Tax Liability |  | (192)
United States [Member] |  |
Deferred Income Taxes Assets | 0 | 0
Deferred Income Tax Liabilities | (402) | (202)
Canada [Member] |  |
Deferred Income Taxes Assets | 744 | 10
Deferred Income Tax Liabilities | $ 0 | $ 0

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