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Disaggregation of Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 4,027 | $ 4,205 | $ 3,669
IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,110 | 2,256 | 2,063
WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,827 | 1,856 | 1,523
Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,345 | 3,421 | 3,081
Electric [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,761 | 1,859 | 1,752
Electric [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,584 | 1,562 | 1,329
Electric [Member] | Retail - Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,220 | 1,233 | 1,115
Electric [Member] | Retail - Residential [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 641 | 673 | 620
Electric [Member] | Retail - Residential [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 579 | 560 | 495
Electric [Member] | Retail - Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 820 | 821 | 763
Electric [Member] | Retail - Commercial [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 519 | 536 | 508
Electric [Member] | Retail - Commercial [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 301 | 285 | 255
Electric [Member] | Retail - Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 968 | 965 | 893
Electric [Member] | Retail - Industrial [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 501 | 538 | 505
Electric [Member] | Retail - Industrial [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 467 | 427 | 388
Electric [Member] | Wholesale [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 213 | 233 | 187
Electric [Member] | Wholesale [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 62 | 64 | 57
Electric [Member] | Wholesale [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 151 | 169 | 130
Electric [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 124 | 169 | 123
Electric [Member] | Other [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 38 | 48 | 62
Electric [Member] | Other [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 86 | 121 | 61
Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 540 | 642 | 456
Gas [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 300 | 351 | 265
Gas [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 240 | 291 | 191
Gas [Member] | Retail - Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 316 | 371 | 257
Gas [Member] | Retail - Residential [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 176 | 202 | 146
Gas [Member] | Retail - Residential [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 140 | 169 | 111
Gas [Member] | Retail - Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 163 | 197 | 139
Gas [Member] | Retail - Commercial [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 86 | 101 | 79
Gas [Member] | Retail - Commercial [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 77 | 96 | 60
Gas [Member] | Retail - Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 16 | 20 | 17
Gas [Member] | Retail - Industrial [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 11 | 14 | 12
Gas [Member] | Retail - Industrial [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5 | 6 | 5
Gas [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 45 | 54 | 43
Gas [Member] | Other [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 27 | 34 | 28
Gas [Member] | Other [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 18 | 20 | 15
Other Utility [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 52 | 49 | 49
Other Utility [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 49 | 46 | 46
Other Utility [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3 | 3 | 3
Other Utility [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7 | 10 | 13
Other Utility [Member] | Other [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4 | 7 | 10
Other Utility [Member] | Other [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3 | 3 | 3
Other Utility [Member] | Steam [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 45 | 39 | 36
Other Utility [Member] | Steam [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 45 | 39 | 36
Non-Utility and Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 90 | 93 | 83
Non-Utility and Other [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 90 | $ 93 | $ 83

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