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Benefit Plans (Amounts Recognized On The Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Amounts recognized on the balance sheets consist of:    
Pension and other benefit obligations $ (374) $ (511)
Pension Plans, Defined Benefit [Member]    
Amounts recognized on the balance sheets consist of:    
Non-current assets 0 0
Current liabilities (2) (2)
Pension and other benefit obligations (238) (365)
Net amounts recognized at December 31 (240) (367)
Amounts recognized in Regulatory Assets consist of:    
Net actuarial loss 429 533
Prior service credit (4) (5)
Net amount recognized at December 31 425 528
Other Postretirement Benefits Plans [Member]    
Amounts recognized on the balance sheets consist of:    
Non-current assets 13 8
Current liabilities (8) (8)
Pension and other benefit obligations (109) (119)
Net amounts recognized at December 31 (104) (119)
Amounts recognized in Regulatory Assets consist of:    
Net actuarial loss 38 54
Prior service credit (1) (1)
Net amount recognized at December 31 37 53
IPL [Member]    
Amounts recognized on the balance sheets consist of:    
Pension and other benefit obligations (127) (186)
IPL [Member] | Pension Plans, Defined Benefit [Member]    
Amounts recognized on the balance sheets consist of:    
Non-current assets 0 0
Current liabilities 0 (1)
Pension and other benefit obligations (105) (161)
Net amounts recognized at December 31 (105) (162)
Amounts recognized in Regulatory Assets consist of:    
Net actuarial loss 180 228
Prior service credit (1) (1)
Net amount recognized at December 31 179 227
IPL [Member] | Other Postretirement Benefits Plans [Member]    
Amounts recognized on the balance sheets consist of:    
Non-current assets 10 4
Current liabilities (2) (2)
Pension and other benefit obligations (18) (19)
Net amounts recognized at December 31 (10) (17)
Amounts recognized in Regulatory Assets consist of:    
Net actuarial loss 13 20
Prior service credit 0 0
Net amount recognized at December 31 13 20
WPL [Member]    
Amounts recognized on the balance sheets consist of:    
Pension and other benefit obligations (159) (222)
WPL [Member] | Pension Plans, Defined Benefit [Member]    
Amounts recognized on the balance sheets consist of:    
Non-current assets 0 0
Current liabilities 0 0
Pension and other benefit obligations (96) (152)
Net amounts recognized at December 31 (96) (152)
Amounts recognized in Regulatory Assets consist of:    
Net actuarial loss 188 233
Prior service credit (1) (1)
Net amount recognized at December 31 187 232
WPL [Member] | Other Postretirement Benefits Plans [Member]    
Amounts recognized on the balance sheets consist of:    
Non-current assets 3 3
Current liabilities (6) (6)
Pension and other benefit obligations (61) (68)
Net amounts recognized at December 31 (64) (71)
Amounts recognized in Regulatory Assets consist of:    
Net actuarial loss 18 25
Prior service credit (1) (1)
Net amount recognized at December 31 $ 17 $ 24