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v3.25.3

Common Equity (Changes in Shareowners' Equity) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | $ 7,004 |
Beginning balance | $ 7,145 | $ 6,791 | 7,004 | $ 6,777
Net income attributable to Alliant Energy common shareowners | 281 | 295 | 668 | 540
Net income |  |  | 668 | 540
Common stock dividends | (130) | (123) | (391) | (369)
Shareowner Direct Plan issuances | 6 | 6 | 18 | 18
Equity-based compensation plans and other | 5 | 3 | 9 | 4
Other comprehensive income (loss), net of tax |  | (4) | (1) | (2)
Ending balance | 7,307 |  | 7,307 |
Ending balance | $ 7,307 | $ 6,968 | $ 7,307 | $ 6,968
Common stock dividends (in dollars per share) | $ 0.5075 | $ 0.48 | $ 1.5225 | $ 1.44
Common Stock [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | $ 3 | $ 3 | $ 3 | $ 3
Ending balance | 3 | 3 | 3 | 3
Additional Paid-in Capital [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 3,075 | 3,042 | 3,060 | 3,030
Shareowner Direct Plan issuances | 6 | 6 | 18 | 18
Equity-based compensation plans and other | 6 | 4 | 9 | 4
Ending balance | 3,087 | 3,052 | 3,087 | 3,052
Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 4,080 | 3,755 | 3,954 | 3,756
Net income attributable to Alliant Energy common shareowners | 281 | 295 | 668 | 540
Common stock dividends | (130) | (123) | (391) | (369)
Ending balance | 4,231 | 3,927 | 4,231 | 3,927
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 0 | 3 | 1 | 1
Other comprehensive income (loss), net of tax |  | (4) | (1) | (2)
Ending balance | 0 | (1) | 0 | (1)
Shares in Deferred Compensation Trust [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | (13) | (12) | (14) | (13)
Equity-based compensation plans and other | (1) | (1) |  |
Ending balance | (14) | (13) | (14) | (13)
IPL [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | 4,461 |
Beginning balance | 4,635 | 4,080 | 4,461 | 3,974
Net income | 165 | 190 | 374 | 272
Common stock dividends | (90) | (50) | (270) | (151)
Capital contributions from parent | 140 | 200 | 285 | 325
Ending balance | 4,850 |  | 4,850 |
Ending balance | 4,850 | 4,420 | 4,850 | 4,420
IPL [Member] | Common Stock [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 33 | 33 | 33 | 33
Ending balance | 33 | 33 | 33 | 33
IPL [Member] | Additional Paid-in Capital [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 3,357 | 3,012 | 3,212 | 2,887
Capital contributions from parent | 140 | 200 | 285 | 325
Ending balance | 3,497 | 3,212 | 3,497 | 3,212
IPL [Member] | Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 1,245 | 1,035 | 1,216 | 1,054
Net income | 165 | 190 | 374 | 272
Common stock dividends | (90) | (50) | (270) | (151)
Ending balance | 1,320 | 1,175 | 1,320 | 1,175
WPL [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | 4,101 |
Beginning balance | 4,180 | 4,010 | 4,101 | 3,897
Net income | 123 | 114 | 321 | 270
Common stock dividends | (44) | (49) | (163) | (147)
Capital contributions from parent | 80 |  | 80 | 55
Ending balance | 4,339 |  | 4,339 |
Ending balance | 4,339 | 4,075 | 4,339 | 4,075
WPL [Member] | Common Stock [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 66 | 66 | 66 | 66
Ending balance | 66 | 66 | 66 | 66
WPL [Member] | Additional Paid-in Capital [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 2,533 | 2,533 | 2,533 | 2,478
Capital contributions from parent | 80 |  | 80 | 55
Ending balance | 2,613 | 2,533 | 2,613 | 2,533
WPL [Member] | Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 1,581 | 1,411 | 1,502 | 1,353
Net income | 123 | 114 | 321 | 270
Common stock dividends | (44) | (49) | (163) | (147)
Ending balance | $ 1,660 | $ 1,476 | $ 1,660 | $ 1,476

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