Commitments And Contingencies (Other Purchase Commitments) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 995
Individual commitments incurred	1
IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	448
Individual commitments incurred	1
WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	505
Individual commitments incurred	1
Natural gas [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	746
Natural gas [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	322
Natural gas [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	424
Coal [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	139
Coal [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	80
Coal [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	59
Other [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	110
Other [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	46
Other [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 22