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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]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 |  |  |  |  | $ 2 | $ 33 | $ 66 | $ 2,046 | $ 2,223 | $ 1,309 | $ 2,546 |  | $ 775 | $ 775 | $ 2 | $ (10) | $ 200 | $ 200
Beginning balance at Dec. 31, 2018 | $ 4,786 |  | $ 3,231 | $ 2,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareowners | 557 |  | 284 |  |  |  |  |  |  |  | 557 |  | 284 |  |  |  |  |
Net income | 567 |  | 294 | 233 |  |  |  |  |  |  |  |  |  | 233 |  |  |  |
Common stock dividends | (337) |  | (168) | (144) |  |  |  |  |  |  | (337) |  | (168) | (144) |  |  |  |
Equity forward settlements and Shareowner Direct Plan issuances | 390 |  |  |  |  |  |  | 390 |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  | 125 | 125 |  |  |  |  | 125 | 125 |  |  |  |  |  |  |  |
Equity-based compensation plans and other | 10 |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |
Payments to redeem cumulative preferred stock of IPL | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |
Ending balance at Dec. 31, 2019 |  |  |  |  | 2 | 33 | 66 | 2,446 | 2,348 | 1,434 | 2,766 |  | 891 | 864 | 1 | (10) | 200 | 200
Ending balance at Dec. 31, 2019 | 5,405 |  | 3,472 | 2,364 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standard, net of tax |  | $ (9) |  |  |  |  |  |  |  |  |  | $ (9) |  |  |  |  |  |
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) |  |
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 | 5,688 |  | 3,764 | 2,478 | 2 | 33 | 66 | 2,704 | 2,752 | 1,459 | 2,994 |  | 979 | 953 | (1) | (11) | 200 | 200
Ending balance at Dec. 31, 2020 | 5,888 |  | 3,964 | 2,478 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standard, net of tax | 2,994 |  | 979 | 953 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |
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
Ending balance at Dec. 31, 2021 | 5,990 |  | 3,769 | 2,823 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standard, net of tax | $ 3,250 |  | $ 929 | $ 1,053 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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