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Segment and Related Information (Income Statement and Balance Sheet Data) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement Data |  |  |
Operating Revenues from external customers | $ 8,312 | $ 7,902 | $ 5,783
Depreciation | 1,254 | 1,181 | 1,082
Amortization | 81 | 52 | 39
Interest Expense | 666 | 513 | 918
Income Before Income Taxes | 924 | 915 | 521
Income Taxes | 184 | 201 | 503
Deferred income taxes and investment tax credits | 322 | 179 | 87
Net income (loss) | 740 | 756 | (1,480)
Cash Flow Data |  |  |
Expenditures for long-lived assets | 2,390 | 2,158 | 1,979
Balance Sheet Data |  |  |
Total Assets | 39,236 | 37,837 |
Kentucky Regulated [Member] |  |  |
Income Statement Data |  |  |
Operating Revenues from external customers | 3,452 | 3,811 | 3,348
Depreciation | 696 | 685 | 647
Amortization | 33 | 23 | 15
Interest Expense | 235 | 205 | 196
Income Before Income Taxes | 689 | 678 | 615
Income Taxes | 137 | 129 | 107
Deferred income taxes and investment tax credits | (17) | 6 | 272
Net income (loss) | 552 | 549 | 508
Cash Flow Data |  |  |
Expenditures for long-lived assets | 950 | 917 | 1,026
Balance Sheet Data |  |  |
Total Assets | 17,029 | 16,904 |
Pennsylvania Regulated [Member] |  |  |
Income Statement Data |  |  |
Operating Revenues from external customers | 3,008 | 3,030 | 2,402
Depreciation | 397 | 393 | 424
Amortization | 41 | 22 | 19
Interest Expense | 223 | 171 | 162
Income Before Income Taxes | 687 | 699 | 599
Income Taxes | 168 | 174 | 154
Deferred income taxes and investment tax credits | 46 | 91 | 79
Net income (loss) | 519 | 525 | 445
Cash Flow Data |  |  |
Expenditures for long-lived assets | 956 | 889 | 904
Balance Sheet Data |  |  |
Total Assets | 14,294 | 13,565 |
Corporate And Other [Member] |  |  |
Income Statement Data |  |  |
Operating Revenues from external customers | 1 | 23 | 33
Depreciation | 5 | 11 | 11
Amortization | 6 | 5 | 5
Interest Expense | 125 | 98 | 560
Income Before Income Taxes | (564) | (404) | (693)
Income Taxes | (137) | (88) | 242
Deferred income taxes and investment tax credits | 245 | 43 | (264)
Net income (loss) | (427) | (316) | (935)
Cash Flow Data |  |  |
Expenditures for long-lived assets | 30 | 84 | 49
Balance Sheet Data |  |  |
Total Assets | 1,398 | 1,287 |
Discontinued Operations Segment |  |  |
Income Statement Data |  |  |
Net income (loss) | 0 | 42 | (1,498)
Rhode Island Regulated |  |  |
Income Statement Data |  |  |
Operating Revenues from external customers | 1,851 | 1,038 | 0
Depreciation | 156 | 92 | 0
Amortization | 1 | 2 | 0
Interest Expense | 83 | 39 | 0
Income Before Income Taxes | 112 | (58) | 0
Income Taxes | 16 | (14) | 0
Deferred income taxes and investment tax credits | 48 | 39 | 0
Net income (loss) | 96 | (44) | 0
Cash Flow Data |  |  |
Expenditures for long-lived assets | 454 | 268 | $ 0
Balance Sheet Data |  |  |
Total Assets | $ 6,515 | $ 6,081 |

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