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Segments Of Business (Schedule Of Segments Of Business) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Revenues $ 1,068 $ 901
Operating income (loss) 248 198
Net income attributable to common shareowners 192 171
Net income 192 174
IPL [Member]    
Segment Reporting Information [Line Items]    
Revenues 550 489
Operating income (loss) 110 103
Net income attributable to common shareowners 87 79
Net income 87 82
WPL [Member]    
Segment Reporting Information [Line Items]    
Revenues 496 395
Operating income (loss) 131 90
Net income 92 84
Electric [Member]    
Segment Reporting Information [Line Items]    
Revenues 773 701
Operating income (loss) 181 147
Electric [Member] | IPL [Member]    
Segment Reporting Information [Line Items]    
Revenues 400 386
Operating income (loss) 75 72
Electric [Member] | WPL [Member]    
Segment Reporting Information [Line Items]    
Revenues 373 315
Operating income (loss) 106 75
Gas [Member]    
Segment Reporting Information [Line Items]    
Revenues 262 170
Operating income (loss) 57 44
Gas [Member] | IPL [Member]    
Segment Reporting Information [Line Items]    
Revenues 139 91
Operating income (loss) 32 30
Gas [Member] | WPL [Member]    
Segment Reporting Information [Line Items]    
Revenues 123 79
Operating income (loss) 25 14
Other Utility [Member]    
Segment Reporting Information [Line Items]    
Revenues 11 13
Operating income (loss) 3 2
Other Utility [Member] | IPL [Member]    
Segment Reporting Information [Line Items]    
Revenues 11 12
Operating income (loss) 3 1
Other Utility [Member] | WPL [Member]    
Segment Reporting Information [Line Items]    
Revenues 0 1
Operating income (loss) 0 1
Utility Business [Member]    
Segment Reporting Information [Line Items]    
Revenues 1,046 884
Operating income (loss) 241 193
Net income attributable to common shareowners 179 163
ATC Holdings, Non-Utility, Parent and Other [Member]    
Segment Reporting Information [Line Items]    
Revenues 22 17
Operating income (loss) 7 5
Net income attributable to common shareowners $ 13 $ 8