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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Deferred Tax Liabilities: |  |  |  |
Differences between book and tax basis of property | $ (1,104) |  |  | $ (966)
Deferred Tax Liabilities, Investment in US Tax Partnerships | (785) |  |  | (578)
Deferred income taxes | 1,490 | $ 1,696 | $ 1,588 | 1,245
Other taxable temporary differences | (438) |  |  | (403)
Deferred Tax Liabilities, Gross | (2,327) |  |  | (1,947)
Deferred Tax Assets: |  |  |  |
Operating loss carryforwards | 933 |  |  | 1,132
Capital loss carryforwards | 501 |  |  | 65
Bad debt and other book provisions | 91 |  |  | 92
Tax credit carryforwards | 48 |  |  | 72
Other deductible temporary differences | 542 |  |  | 409
Total gross deferred tax asset | 2,115 |  |  | 1,770
Less: Valuation allowance | (913) |  |  | (672)
Total net deferred tax asset | 1,202 |  |  | 1,098
Total deferred tax liability | (1,125) |  |  | $ (849)
General Business Tax Credit Carryforward |  |  |  |
Deferred Tax Assets: |  |  |  |
Tax credit carryforward | 54 |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Capital Loss Carryforwards | $ 1,700 |  |  |

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