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Common Equity (Changes in Shareowners' Equity) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | $ 6,777 |
Beginning balance | $ 6,817 | $ 6,328 | 6,777 | $ 6,276
Net income attributable to common shareowners | 87 | 160 | 245 | 323
Net income |  |  | 245 | 323
Common stock dividends | (123) | (113) | (246) | (226)
Shareowner Direct Plan issuances | 6 | 70 | 12 | 76
Equity-based compensation plans and other | 3 | 3 | 1 | 0
Other comprehensive income (loss), net of tax | 1 | 4 | 2 | 3
Ending balance | 6,791 |  | 6,791 |
Ending balance | $ 6,791 | $ 6,452 | $ 6,791 | $ 6,452
Common stock dividends (in dollars per share) | $ 0.48 | $ 0.4525 | $ 0.96 | $ 0.905
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 | 3,033 | 2,780 | 3,030 | 2,777
Shareowner Direct Plan issuances | 6 | 70 | 12 | 76
Equity-based compensation plans and other | 3 | 4 |  | 1
Ending balance | 3,042 | 2,854 | 3,042 | 2,854
Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 3,791 | 3,559 | 3,756 | 3,509
Net income attributable to common shareowners | 87 | 160 | 245 | 323
Common stock dividends | (123) | (113) | (246) | (226)
Ending balance | 3,755 | 3,606 | 3,755 | 3,606
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 2 | (1) | 1 | 0
Other comprehensive income (loss), net of tax | 1 | 4 | 2 | 3
Ending balance | 3 | 3 | 3 | 3
Shares in Deferred Compensation Trust [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | (12) | (13) | (13) | (13)
Equity-based compensation plans and other |  | (1) | 1 | (1)
Ending balance | (12) | (14) | (12) | (14)
IPL [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | 3,974 |
Beginning balance | 4,037 | 3,810 | 3,974 | 3,808
Net income attributable to common shareowners | 18 | 89 | 81 | 161
Net income | 18 | 89 | 81 | 161
Common stock dividends | (50) | (70) | (100) | (140)
Capital contributions from parent | 75 | 40 | 125 | 40
Ending balance | 4,080 |  | 4,080 |
Ending balance | 4,080 | 3,869 | 4,080 | 3,869
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 | 2,937 | 2,807 | 2,887 | 2,807
Capital contributions from parent | 75 | 40 | 125 | 40
Ending balance | 3,012 | 2,847 | 3,012 | 2,847
IPL [Member] | Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 1,067 | 970 | 1,054 | 968
Net income | 18 | 89 | 81 | 161
Common stock dividends | (50) | (70) | (100) | (140)
Ending balance | 1,035 | 989 | 1,035 | 989
WPL [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance |  |  | 3,897 |
Beginning balance | 3,995 | 3,713 | 3,897 | 3,491
Net income attributable to common shareowners | 64 | 72 | 156 | 160
Net income | 64 | 72 | 156 | 160
Common stock dividends | (49) | (46) | (98) | (92)
Capital contributions from parent |  |  | 55 | 180
Ending balance | 4,010 |  | 4,010 |
Ending balance | 4,010 | 3,739 | 4,010 | 3,739
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 | 2,413 | 2,478 | 2,233
Capital contributions from parent |  |  | 55 | 180
Ending balance | 2,533 | 2,413 | 2,533 | 2,413
WPL [Member] | Retained Earnings [Member] |  |  |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |  |  |
Beginning balance | 1,396 | 1,234 | 1,353 | 1,192
Net income | 64 | 72 | 156 | 160
Common stock dividends | (49) | (46) | (98) | (92)
Ending balance | $ 1,411 | $ 1,260 | $ 1,411 | $ 1,260

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