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Segments Of Business (Schedule Of Segment Of Business) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Electric utility | $ 3,372 | $ 3,345 | $ 3,421
Gas utility | 465 | 540 | 642
Other | 144 | 142 | 142
Total revenues | 3,981 | 4,027 | 4,205
Electric production fuel and purchased power | 628 | 736 | 830
Electric transmission service | 613 | 583 | 573
Cost of gas sold | 224 | 299 | 389
Asset valuation charge for IPL's Lansing Generating Station | 60 | 0 | 0
Other operation and maintenance | 676 | 675 | 704
Depreciation and amortization | 772 | 676 | 671
Interest expense | 449 | 394 | 325
Equity income from unconsolidated investments, net | (61) | (61) | (51)
Income tax expense (benefit) | (114) | 4 | 22
Other | 44 | 18 | 56
Net income (loss) | 690 | 703 | 686
Total assets | 22,714 | 21,237 | 20,163
Investments in equity method subsidiaries | 623 | 585 | 542
Construction and acquisition expenditures | 2,249 | 1,854 | 1,484
IPL [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric utility | 1,747 | 1,761 | 1,859
Gas utility | 250 | 300 | 351
Total revenues | 2,046 | 2,110 | 2,256
Electric production fuel and purchased power | 269 | 282 | 383
Electric transmission service | 417 | 420 | 407
Cost of gas sold | 123 | 166 | 206
Asset valuation charge for IPL's Lansing Generating Station | 60 | 0 | 0
Depreciation and amortization | 404 | 388 | 381
Income tax expense (benefit) | (129) | (58) | (50)
Net income (loss) | 362 | 366 | 360
Total assets | 11,407 | 10,489 |
WPL [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric utility | 1,625 | 1,584 | 1,562
Gas utility | 215 | 240 | 291
Total revenues | 1,845 | 1,827 | 1,856
Electric production fuel and purchased power | 359 | 455 | 447
Electric transmission service | 196 | 163 | 166
Cost of gas sold | 101 | 134 | 183
Depreciation and amortization | 357 | 280 | 283
Income tax expense (benefit) | 11 | 60 | 66
Net income (loss) | 345 | 345 | 315
Total assets | 10,106 | 9,634 |
Total Reportable Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric utility | 3,372 | 3,345 | 3,421
Gas utility | 465 | 540 | 642
Other | 54 | 52 | 49
Total revenues | 3,891 | 3,937 | 4,112
Electric production fuel and purchased power | 628 | 737 | 830
Electric transmission service | 613 | 583 | 573
Cost of gas sold | 224 | 300 | 389
Asset valuation charge for IPL's Lansing Generating Station | 60 |  |
Other operation and maintenance | 637 | 624 | 647
Depreciation and amortization | 761 | 668 | 664
Interest expense | 342 | 304 | 269
Equity income from unconsolidated investments, net | (2) | (3) | (1)
Income tax expense (benefit) | (118) | 2 | 16
Other | 39 | 11 | 50
Net income (loss) | 707 | 711 | 675
Total assets | 21,513 | 20,123 | 19,062
Investments in equity method subsidiaries | 22 | 21 | 20
Construction and acquisition expenditures | 2,052 | 1,731 | 1,392
IPL [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric utility | 1,747 | 1,761 | 1,859
Gas utility | 250 | 300 | 351
Other | 49 | 49 | 46
Total revenues | 2,046 | 2,110 | 2,256
Electric production fuel and purchased power | 269 | 282 | 383
Electric transmission service | 417 | 420 | 407
Cost of gas sold | 123 | 166 | 206
Asset valuation charge for IPL's Lansing Generating Station | 60 |  |
Other operation and maintenance | 358 | 353 | 369
Depreciation and amortization | 404 | 388 | 381
Interest expense | 177 | 155 | 148
Equity income from unconsolidated investments, net | 0 | 0 | 0
Income tax expense (benefit) | (129) | (58) | (50)
Other | 5 | 38 | 52
Net income (loss) | 362 | 366 | 360
Total assets | 11,407 | 10,489 | 10,075
Investments in equity method subsidiaries | 5 | 5 | 5
Construction and acquisition expenditures | 1,224 | 712 | 372
WPL [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric utility | 1,625 | 1,584 | 1,562
Gas utility | 215 | 240 | 291
Other | 5 | 3 | 3
Total revenues | 1,845 | 1,827 | 1,856
Electric production fuel and purchased power | 359 | 455 | 447
Electric transmission service | 196 | 163 | 166
Cost of gas sold | 101 | 134 | 183
Asset valuation charge for IPL's Lansing Generating Station | 0 |  |
Other operation and maintenance | 279 | 271 | 278
Depreciation and amortization | 357 | 280 | 283
Interest expense | 165 | 149 | 121
Equity income from unconsolidated investments, net | (2) | (3) | (1)
Income tax expense (benefit) | 11 | 60 | 66
Other | 34 | (27) | (2)
Net income (loss) | 345 | 345 | 315
Total assets | 10,106 | 9,634 | 8,987
Investments in equity method subsidiaries | 17 | 16 | 15
Construction and acquisition expenditures | 828 | 1,019 | 1,020
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other | 90 | 90 | 93
Total revenues | 90 | 90 | 93
Other operation and maintenance | 39 | 51 | 57
Depreciation and amortization | 11 | 8 | 7
Interest expense | 107 | 90 | 56
Equity income from unconsolidated investments, net | (59) | (58) | (50)
Income tax expense (benefit) | 4 | 2 | 6
Other | 5 | 5 | 6
Net income (loss) | (17) | (8) | 11
Total assets | 1,201 | 1,114 | 1,101
Investments in equity method subsidiaries | 601 | 564 | 522
Construction and acquisition expenditures | $ 197 | $ 123 | $ 92

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