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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, 2017         $ 2 $ 33 $ 66 $ 1,845 $ 1,798 $ 1,109 $ 2,346   $ 679 $ 707 $ 0 $ (11) $ 200 $ 200
Beginning balance at Dec. 31, 2017 $ 4,382   $ 2,710 $ 1,882                            
Increase (Decrease) in Shareowners' Equity [Roll Forward]                                    
Net income attributable to common shareowners 512   264               512   264          
Net income 522   274 208                   208        
Common stock dividends (312)   (168) (140)             (312)   (168) (140)        
Equity forward settlements, At-the-market offering program and Shareowner Direct Plan issuances 197             197                    
Capital contributions from parent     425 200         425 200                
Equity-based compensation plans and other 5             4               1    
Other comprehensive income (loss), net of tax 2                           2      
Ending balance at Dec. 31, 2018         2 33 66 2,046 2,223 1,309 2,546   775 775 2 (10) 200 200
Ending 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, At-the-market offering program and Shareowner Direct Plan issuances 390             390                    
Capital contributions from parent     125 125         125 125                
Equity-based compensation plans and other 10             10                    
Other comprehensive income (loss), net of tax (1)                           (1)      
Ending balance at Dec. 31, 2019 5,205   3,272 2,364 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]                                    
Retained earnings 2,766 $ (9) 891 864               $ (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, At-the-market offering program and Shareowner Direct Plan issuances 247             247                    
Capital contributions from parent     404 25         404 25                
Equity-based compensation plans and other 10             11               (1)    
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]                                    
Retained earnings $ 2,994   $ 979 $ 953