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Business Segment Information (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Asset Impairment Charges | $ 12,795 | $ 0 | $ 12,795 | $ 131,775 |
Depreciation, Depletion and Amortization | 582,698 | 553,801 | 1,730,722 | 1,666,399 |
Investment Income, Net | 106,090 | 64,316 | 226,915 | 285,600 |
Interest Expense, Nonoperating | 324,878 | 295,143 | 976,743 | 851,920 |
Income Tax Expense (Benefit) | 205,307 | 215,475 | 443,747 | 270,103 |
Assets | 69,848,407 |  | 69,848,407 |  | $ 64,790,032
Segment, Expenditure, Addition to Long-Lived Assets |  |  | 5,726,780 | 4,016,120 |
Consolidation, Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset Impairment Charges | 0 |  | 0 | 0 |
Depreciation, Depletion and Amortization | 0 | 0 | 0 | 0 |
Investment Income, Net | (73,375) | (77,476) | (223,807) | (238,046) |
Interest Expense, Nonoperating | (195) | 105 | (838) | (2,017) |
Income Tax Expense (Benefit) | 0 | 0 | 0 | 0 |
Assets | (4,889,477) |  | (4,889,477) |  | (4,882,991)
Segment, Expenditure, Addition to Long-Lived Assets |  |  | 0 | 0 |
Utility [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset Impairment Charges | 12,795 |  | 12,795 | 131,775 |
Depreciation, Depletion and Amortization | 580,980 | 552,161 | 1,725,553 | 1,661,613 |
Investment Income, Net | 177,587 | 137,518 | 445,010 | 504,018 |
Interest Expense, Nonoperating | 268,090 | 228,493 | 796,254 | 666,151 |
Income Tax Expense (Benefit) | 223,065 | 237,225 | 490,174 | 384,790 |
Assets | 73,992,202 |  | 73,992,202 |  | 68,951,564
Segment, Expenditure, Addition to Long-Lived Assets |  |  | 5,725,533 | 4,015,162 |
Corporate Segment and Other Operating Segment [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset Impairment Charges | 0 |  | 0 | 0 |
Depreciation, Depletion and Amortization | 1,718 | 1,640 | 5,169 | 4,786 |
Investment Income, Net | 1,878 | 4,274 | 5,712 | 19,628 |
Interest Expense, Nonoperating | 56,983 | 66,545 | 181,327 | 187,786 |
Income Tax Expense (Benefit) | (17,758) | $ (21,750) | (46,427) | (114,687) |
Assets | $ 745,682 |  | 745,682 |  | $ 721,459
Segment, Expenditure, Addition to Long-Lived Assets |  |  | $ 1,247 | $ 958 |

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