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Consolidated Statements of Common Equity - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment [Member] | IPL [Member] | WPL [Member] | Common Stock [Member] | Common Stock [Member] IPL [Member] | Common Stock [Member] WPL [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] IPL [Member] | Additional Paid-in Capital [Member] WPL [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] IPL [Member] | Retained Earnings [Member] WPL [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Shares in Deferred Compensation Trust [Member] | Cumulative Preferred Stock [Member] | Cumulative Preferred Stock [Member] IPL [Member] | Noncontrolling Interest [Member] | Noncontrolling Interest [Member] WPL [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | $ (9) |  |  |  |  |  |  |  |  |  | $ (9) |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 |  |  |  |  | $ 2 | $ 33 | $ 66 | $ 2,446 | $ 2,348 | $ 1,434 | $ 2,766 |  | $ 891 | $ 864 | $ 1 | $ (10) | $ 200 | $ 200 | $ 0 | $ 0
Beginning balance at Dec. 31, 2019 | $ 5,405 |  | $ 3,472 | $ 2,364 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareowners | 614 |  | 324 |  |  |  |  |  |  |  | 614 |  | 324 |  |  |  |  |  |  |
Net income | 624 |  | 334 | 249 |  |  |  |  |  |  |  |  |  | 249 |  |  |  |  |  |
Common stock dividends | (377) |  | (236) | (160) |  |  |  |  |  |  | (377) |  | (236) | (160) |  |  |  |  |  |
Equity forward settlements and Shareowner Direct Plan issuances | 247 |  |  |  |  |  |  | 247 |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  | 404 | 25 |  |  |  |  | 404 | 25 |  |  |  |  |  |  |  |  |  |
Equity-based compensation plans and other | 10 |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  | (1) |  |  |  |
Contributions from noncontrolling interest | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interest | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to redeem cumulative preferred stock of IPL | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (2) |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  |
Ending balance at Dec. 31, 2020 |  |  |  |  | 2 | 33 | 66 | 2,704 | 2,752 | 1,459 | 2,994 |  | 979 | 953 | (1) | (11) | 200 | 200 | 0 | 0
Ending balance at Dec. 31, 2020 | 5,888 |  | 3,964 | 2,478 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | $ (9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareowners | 659 |  | 350 |  |  |  |  |  |  |  | 659 |  | 350 |  |  |  |  |  |  |
Net income | 674 |  | 365 | 268 |  |  |  |  |  |  |  |  |  | 268 |  |  |  |  |  |
Common stock dividends | (403) |  | (400) | (168) |  |  |  |  |  |  | (403) |  | (400) | (168) |  |  |  |  |  |
Equity forward settlements and Shareowner Direct Plan issuances | 28 |  |  |  | 1 |  |  | 27 |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  | 50 | 245 |  |  |  |  | 50 | 245 |  |  |  |  |  |  |  |  |  |
Equity-based compensation plans and other | 17 |  | 5 |  |  |  |  | 18 | 5 |  |  |  |  |  |  | (1) |  |  |  |
Contributions from noncontrolling interest | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interest | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to redeem cumulative preferred stock of IPL | (200) |  | (200) |  |  |  |  |  |  |  |  |  |  |  |  |  | (200) | (200) |  |
Other comprehensive income (loss), net of tax | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Ending balance at Dec. 31, 2021 | 5,990 |  | 3,769 | 2,823 | 3 | 33 | 66 | 2,749 | 2,807 | 1,704 | 3,250 |  | 929 | 1,053 | 0 | (12) | 0 | 0 | 0 | 0
Ending balance at Dec. 31, 2021 | 5,990 |  | 3,769 | 2,823 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 3,250 |  | 929 | 1,053 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareowners | 686 |  | 360 |  |  |  |  |  |  |  | 686 |  | 360 |  |  |  |  |  |  |
Net income | 686 |  | 360 | 315 |  |  |  |  |  |  |  |  |  | 315 |  |  |  |  |  |
Common stock dividends | (428) |  | (321) | (176) |  |  |  |  |  |  | (428) |  | (321) | (176) |  |  |  |  |  |
Equity forward settlements and Shareowner Direct Plan issuances | 25 |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  | 0 | 530 |  |  |  |  |  | 530 |  |  |  |  |  |  |  |  |  |
Equity-based compensation plans and other | 3 |  |  | (1) |  |  |  | 3 |  | (1) | 1 |  |  |  |  | (1) |  |  |  |
Contributions from noncontrolling interest | 29 |  |  | 29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29 | 29
Distributions to noncontrolling interest | (29) |  |  | (29) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (29) | (29)
Payments to redeem cumulative preferred stock of IPL | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2022 | 6,276 |  | 3,808 | 3,491 | $ 3 | $ 33 | $ 66 | $ 2,777 | $ 2,807 | $ 2,233 | $ 3,509 |  | $ 968 | $ 1,192 | $ 0 | $ (13) | $ 0 | $ 0 | $ 0 | $ 0
Ending balance at Dec. 31, 2022 | 6,276 |  | 3,808 | 3,491 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 3,509 |  | $ 968 | $ 1,192 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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