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Disaggregation of Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 4,205 | $ 3,669 | $ 3,416
IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,256 | 2,063 | 1,947
WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,856 | 1,523 | 1,395
Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,421 | 3,081 | 2,920
Electric [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,859 | 1,752 | 1,695
Electric [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,562 | 1,329 | 1,225
Electric [Member] | Retail - Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,233 | 1,115 | 1,093
Electric [Member] | Retail - Residential [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 673 | 620 | 602
Electric [Member] | Retail - Residential [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 560 | 495 | 491
Electric [Member] | Retail - Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 821 | 763 | 718
Electric [Member] | Retail - Commercial [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 536 | 508 | 474
Electric [Member] | Retail - Commercial [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 285 | 255 | 244
Electric [Member] | Retail - Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 965 | 893 | 841
Electric [Member] | Retail - Industrial [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 538 | 505 | 488
Electric [Member] | Retail - Industrial [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 427 | 388 | 353
Electric [Member] | Wholesale [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 233 | 187 | 168
Electric [Member] | Wholesale [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 64 | 57 | 57
Electric [Member] | Wholesale [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 169 | 130 | 111
Electric [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 169 | 123 | 100
Electric [Member] | Other [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 48 | 62 | 74
Electric [Member] | Other [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 121 | 61 | 26
Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 642 | 456 | 373
Gas [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 351 | 265 | 208
Gas [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 291 | 191 | 165
Gas [Member] | Retail - Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 371 | 257 | 214
Gas [Member] | Retail - Residential [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 202 | 146 | 116
Gas [Member] | Retail - Residential [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 169 | 111 | 98
Gas [Member] | Retail - Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 197 | 139 | 107
Gas [Member] | Retail - Commercial [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 101 | 79 | 59
Gas [Member] | Retail - Commercial [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 96 | 60 | 48
Gas [Member] | Retail - Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 20 | 17 | 12
Gas [Member] | Retail - Industrial [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 14 | 12 | 8
Gas [Member] | Retail - Industrial [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 6 | 5 | 4
Gas [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 54 | 43 | 40
Gas [Member] | Other [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 34 | 28 | 25
Gas [Member] | Other [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 20 | 15 | 15
Other Utility [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 49 | 49 | 49
Other Utility [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 46 | 46 | 44
Other Utility [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3 | 3 | 5
Other Utility [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 10 | 13 | 13
Other Utility [Member] | Other [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7 | 10 | 8
Other Utility [Member] | Other [Member] | WPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3 | 3 | 5
Other Utility [Member] | Steam [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 39 | 36 | 36
Other Utility [Member] | Steam [Member] | IPL [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 39 | 36 | 36
Non-Utility and Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 93 | 83 | 74
Non-Utility and Other [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 93 | $ 83 | $ 74

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