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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