Commitments And Contingencies (Other Purchase Commitments) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 1,352
Individual commitments incurred	1
IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	624
Individual commitments incurred	1
WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	698
Individual commitments incurred	1
Natural gas [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	1,083
Natural gas [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	494
Natural gas [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	589
Coal [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	163
Coal [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	79
Coal [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	84
Other [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	106
Other [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	51
Other [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 25