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Segments Of Business (Schedule Of Segments Of Business) (Details) - USD ($) $ in Millions | 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] |  |  |  |  |
Electric utility revenues | $ 1,124 | $ 999 | $ 2,828 | $ 2,579 |
Gas utility revenues | 51 | 49 | 366 | 322 |
Other revenues | 35 | 33 | 104 | 104 |
Total revenues | 1,210 | 1,081 | 3,298 | 3,005 |
Electric production fuel and purchased power | 239 | 192 | 564 | 493 |
Electric transmission service | 166 | 165 | 474 | 464 |
Cost of gas sold | 12 | 13 | 180 | 152 |
Asset valuation charge for IPL's Lansing Generating Station | 0 | 0 | 0 | 60 |
Other operation and maintenance | 204 | 174 | 530 | 510 |
Depreciation and amortization | 211 | 195 | 631 | 571 |
Interest expense | 128 | 114 | 372 | 329 |
Equity income from unconsolidated investments, net | (18) | (14) | (41) | (44) |
Income tax expense (benefit) | (18) | (62) | (109) | (104) |
Other | 5 | 9 | 29 | 34 |
Net income (loss) | 281 | 295 | 668 | 540 |
Total assets | 24,627 | 22,829 | 24,627 | 22,829 | $ 22,714
Investments in equity method subsidiaries | 668 | 616 | 668 | 616 |
Construction and acquisition expenditures | 583 | 474 | 1,648 | 1,434 |
IPL [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Electric utility revenues | 608 | 523 | 1,455 | 1,318 |
Gas utility revenues | 27 | 27 | 185 | 175 |
Total revenues | 647 | 561 | 1,676 | 1,527 |
Electric production fuel and purchased power | 106 | 79 | 213 | 195 |
Electric transmission service | 115 | 115 | 322 | 317 |
Cost of gas sold | 7 | 8 | 89 | 85 |
Asset valuation charge for IPL's Lansing Generating Station | 0 | 0 | 0 | 60 |
Depreciation and amortization | 116 | 100 | 346 | 294 |
Income tax expense (benefit) | (21) | (68) | (98) | (112) |
Net income (loss) | 165 | 190 | 374 | 272 |
Total assets | 12,433 |  | 12,433 |  | 11,407
WPL [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Electric utility revenues | 516 | 476 | 1,373 | 1,261 |
Gas utility revenues | 24 | 22 | 181 | 147 |
Total revenues | 540 | 499 | 1,555 | 1,410 |
Electric production fuel and purchased power | 133 | 112 | 351 | 298 |
Electric transmission service | 51 | 49 | 152 | 148 |
Cost of gas sold | 5 | 5 | 91 | 67 |
Depreciation and amortization | 92 | 91 | 275 | 269 |
Income tax expense (benefit) | 1 | 4 | (9) | 13 |
Net income (loss) | 123 | 114 | 321 | 270 |
Total assets | 10,331 |  | 10,331 |  | $ 10,106
Total Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Electric utility revenues | 1,124 | 999 | 2,828 | 2,579 |
Gas utility revenues | 51 | 49 | 366 | 322 |
Other revenues | 12 | 12 | 37 | 36 |
Total revenues | 1,187 | 1,060 | 3,231 | 2,937 |
Electric production fuel and purchased power | 239 | 191 | 564 | 493 |
Electric transmission service | 166 | 164 | 474 | 465 |
Cost of gas sold | 12 | 13 | 180 | 152 |
Asset valuation charge for IPL's Lansing Generating Station |  |  |  | 60 |
Other operation and maintenance | 192 | 168 | 497 | 481 |
Depreciation and amortization | 208 | 191 | 621 | 563 |
Interest expense | 97 | 86 | 283 | 252 |
Equity income from unconsolidated investments, net | (1) | (1) | (1) | (2) |
Income tax expense (benefit) | (20) | (64) | (107) | (99) |
Other | 6 | 8 | 25 | 30 |
Net income (loss) | 288 | 304 | 695 | 542 |
Total assets | 22,764 | 21,618 | 22,764 | 21,618 |
Investments in equity method subsidiaries | 24 | 22 | 24 | 22 |
Construction and acquisition expenditures | 511 | 410 | 1,487 | 1,280 |
IPL [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Electric utility revenues | 608 | 523 | 1,455 | 1,318 |
Gas utility revenues | 27 | 27 | 185 | 175 |
Other revenues | 12 | 11 | 36 | 34 |
Total revenues | 647 | 561 | 1,676 | 1,527 |
Electric production fuel and purchased power | 106 | 79 | 213 | 195 |
Electric transmission service | 115 | 115 | 322 | 317 |
Cost of gas sold | 7 | 8 | 89 | 85 |
Asset valuation charge for IPL's Lansing Generating Station |  |  |  | 60 |
Other operation and maintenance | 108 | 96 | 275 | 281 |
Depreciation and amortization | 116 | 100 | 346 | 294 |
Interest expense | 54 | 44 | 154 | 128 |
Equity income from unconsolidated investments, net | 0 | 0 | 0 | 0 |
Income tax expense (benefit) | (21) | (68) | (98) | (112) |
Other | (3) | (3) | 1 | 7 |
Net income (loss) | 165 | 190 | 374 | 272 |
Total assets | 12,433 | 11,680 | 12,433 | 11,680 |
Investments in equity method subsidiaries | 5 | 5 | 5 | 5 |
Construction and acquisition expenditures | 348 | 202 | 976 | 702 |
WPL [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Electric utility revenues | 516 | 476 | 1,373 | 1,261 |
Gas utility revenues | 24 | 22 | 181 | 147 |
Other revenues | 0 | 1 | 1 | 2 |
Total revenues | 540 | 499 | 1,555 | 1,410 |
Electric production fuel and purchased power | 133 | 112 | 351 | 298 |
Electric transmission service | 51 | 49 | 152 | 148 |
Cost of gas sold | 5 | 5 | 91 | 67 |
Other operation and maintenance | 84 | 72 | 222 | 200 |
Depreciation and amortization | 92 | 91 | 275 | 269 |
Interest expense | 43 | 42 | 129 | 124 |
Equity income from unconsolidated investments, net | (1) | (1) | (1) | (2) |
Income tax expense (benefit) | 1 | 4 | (9) | 13 |
Other | 9 | 11 | 24 | 23 |
Net income (loss) | 123 | 114 | 321 | 270 |
Total assets | 10,331 | 9,938 | 10,331 | 9,938 |
Investments in equity method subsidiaries | 19 | 17 | 19 | 17 |
Construction and acquisition expenditures | 163 | 208 | 511 | 578 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other revenues | 23 | 21 | 67 | 68 |
Total revenues | 23 | 21 | 67 | 68 |
Other operation and maintenance | 12 | 6 | 33 | 29 |
Depreciation and amortization | 3 | 4 | 10 | 8 |
Interest expense | 31 | 28 | 89 | 77 |
Equity income from unconsolidated investments, net | (17) | (13) | (40) | (42) |
Income tax expense (benefit) | 2 | 2 | (2) | (5) |
Other | (1) | 3 | 4 | 3 |
Net income (loss) | (7) | (9) | (27) | (2) |
Total assets | 1,863 | 1,211 | 1,863 | 1,211 |
Investments in equity method subsidiaries | 644 | 594 | 644 | 594 |
Construction and acquisition expenditures | $ 72 | $ 64 | $ 161 | $ 154 |

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