Commitments And Contingencies (Other Purchase Commitments) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 1,046
Individual commitments incurred	1
IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	472
Individual commitments incurred	1
WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	531
Individual commitments incurred	1
Natural gas [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	773
Natural gas [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	316
Natural gas [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	457
Coal [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	155
Coal [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	106
Coal [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	49
Other [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	118
Other [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	50
Other [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 25