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v3.22.1

Common Equity (Changes in Shareowners' Equity) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | $ 5,990 |
Beginning balance | 5,990 | $ 5,888
Net income attributable to common shareowners | 192 | 171
Net income | 192 | 174
Common stock dividends | (107) | (102)
Shareowner Direct Plan issuances | 7 | 8
Equity-based compensation plans and other | (5) | 1
Ending balance | 6,077 |
Ending balance | $ 6,077 | $ 5,966
Common stock dividends (in dollars per share) | $ 0.4275 | $ 0.4025
Common Stock [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | $ 3 | $ 2
Shareowner Direct Plan issuances |  | 1
Ending balance | 3 | 3
Additional Paid-in Capital [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 2,749 | 2,704
Shareowner Direct Plan issuances | 7 | 7
Equity-based compensation plans and other | (6) | 1
Ending balance | 2,750 | 2,712
Retained Earnings [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 3,250 | 2,994
Net income attributable to common shareowners | 192 | 171
Common stock dividends | (107) | (102)
Equity-based compensation plans and other | 1 |
Ending balance | 3,336 | 3,063
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 0 | (1)
Ending balance | 0 | (1)
Shares in Deferred Compensation Trust [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | (12) | (11)
Ending balance | (12) | (11)
Cumulative Preferred Stock [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 0 | 200
Ending balance | 0 | 200
IPL [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 3,769 |
Beginning balance | 3,769 | 3,964
Net income attributable to common shareowners | 87 | 79
Net income | 87 | 82
Common stock dividends | (81) | (101)
Ending balance | 3,775 |
Ending balance | 3,775 | 3,942
IPL [Member] | Common Stock [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 33 | 33
Ending balance | 33 | 33
IPL [Member] | Additional Paid-in Capital [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 2,807 | 2,752
Ending balance | 2,807 | 2,752
IPL [Member] | Retained Earnings [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 929 | 979
Net income attributable to common shareowners | 87 | 79
Common stock dividends | (81) | (101)
Ending balance | 935 | 957
IPL [Member] | Cumulative Preferred Stock [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 0 | 200
Ending balance | 0 | 200
WPL [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 2,823 |
Beginning balance | 2,823 | 2,478
Net income | 92 | 84
Common stock dividends | (44) | (42)
Capital contributions from parent | 180 | 125
Ending balance | 3,051 |
Ending balance | 3,051 | 2,645
WPL [Member] | Common Stock [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 66 | 66
Ending balance | 66 | 66
WPL [Member] | Additional Paid-in Capital [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 1,704 | 1,459
Capital contributions from parent | 180 | 125
Ending balance | 1,884 | 1,584
WPL [Member] | Retained Earnings [Member] |  |
Changes in Shareowners' Equity Roll Forward [Line Items] |  |
Beginning balance | 1,053 | 953
Net income | 92 | 84
Common stock dividends | (44) | (42)
Ending balance | $ 1,101 | $ 995

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