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v3.23.3

Common Equity (Changes in Shareowners' Equity) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | $ 6,276 |
Beginning balance | $ 6,452 | $ 6,166 | 6,276 | $ 5,990
Net income attributable to common shareowners | 259 | 227 | 582 | 579
Net income |  |  | 582 | 579
Common stock dividends | (115) | (106) | (341) | (322)
At-the-market offering program and Shareowner Direct Plan issuances | 125 | 6 | 201 | 19
Equity-based compensation plans and other | 4 | 1 | 4 | (1)
Other comprehensive income, net of tax | 1 |  | 4 |
Contributions from noncontrolling interest |  |  | 0 | 29
Distributions to noncontrolling interest |  | (29) | 0 | (29)
Ending balance | 6,726 |  | 6,726 |
Ending balance | $ 6,726 | $ 6,265 | $ 6,726 | $ 6,265
Common stock dividends (in dollars per share) | $ 0.4525 | $ 0.4275 | $ 1.3575 | $ 1.2825
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 | 2,854 | 2,759 | 2,777 | 2,749
At-the-market offering program and Shareowner Direct Plan issuances | 125 | 6 | 201 | 19
Equity-based compensation plans and other | 3 | 2 | 4 | (1)
Ending balance | 2,982 | 2,767 | 2,982 | 2,767
Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 3,606 | 3,387 | 3,509 | 3,250
Net income attributable to common shareowners | 259 | 227 | 582 | 579
Common stock dividends | (115) | (106) | (341) | (322)
Equity-based compensation plans and other |  |  |  | 1
Ending balance | 3,750 | 3,508 | 3,750 | 3,508
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 3 | 0 | 0 | 0
Other comprehensive income, net of tax | 1 |  | 4 |
Ending balance | 4 | 0 | 4 | 0
Shares in Deferred Compensation Trust [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | (14) | (12) | (13) | (12)
Equity-based compensation plans and other | 1 | (1) |  | (1)
Ending balance | (13) | (13) | (13) | (13)
Noncontrolling Interest [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 0 | 29 | 0 | 0
Contributions from noncontrolling interest |  |  |  | 29
Distributions to noncontrolling interest |  | (29) |  | (29)
Ending balance | 0 | 0 | 0 | 0
IPL [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | 3,808 |
Beginning balance | 3,869 | 3,782 | 3,808 | 3,769
Net income | 170 | 154 | 331 | 327
Common stock dividends | (70) | (80) | (210) | (240)
Capital contributions from parent | 20 |  | 60 | 0
Ending balance | 3,989 |  | 3,989 |
Ending balance | 3,989 | 3,856 | 3,989 | 3,856
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 | 2,847 | 2,807 | 2,807 | 2,807
Capital contributions from parent | 20 |  | 60 |
Ending balance | 2,867 | 2,807 | 2,867 | 2,807
IPL [Member] | Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 989 | 942 | 968 | 929
Net income | 170 | 154 | 331 | 327
Common stock dividends | (70) | (80) | (210) | (240)
Ending balance | 1,089 | 1,016 | 1,089 | 1,016
WPL [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | 3,491 |
Beginning balance | 3,739 | 3,183 | 3,491 | 2,823
Net income | 107 | 91 | 267 | 247
Common stock dividends | (46) | (44) | (138) | (133)
Equity-based compensation plans and other |  |  |  | (1)
Capital contributions from parent | 65 | 155 | 245 | 420
Contributions from noncontrolling interest |  |  | 0 | 29
Distributions to noncontrolling interest |  | (29) | 0 | (29)
Ending balance | 3,865 |  | 3,865 |
Ending balance | 3,865 | 3,356 | 3,865 | 3,356
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 | 2,413 | 1,968 | 2,233 | 1,704
Equity-based compensation plans and other |  |  |  | (1)
Capital contributions from parent | 65 | 155 | 245 | 420
Ending balance | 2,478 | 2,123 | 2,478 | 2,123
WPL [Member] | Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 1,260 | 1,120 | 1,192 | 1,053
Net income | 107 | 91 | 267 | 247
Common stock dividends | (46) | (44) | (138) | (133)
Ending balance | 1,321 | 1,167 | 1,321 | 1,167
WPL [Member] | Noncontrolling Interest [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 0 | 29 | 0 | 0
Contributions from noncontrolling interest |  |  |  | 29
Distributions to noncontrolling interest |  | (29) |  | (29)
Ending balance | $ 0 | $ 0 | $ 0 | $ 0

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