Commitments And Contingencies (Other Purchase Commitments) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 1,568
Individual commitments incurred	1
IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	707
Individual commitments incurred	1
WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	827
Individual commitments incurred	1
Natural gas [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	1,280
Natural gas [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	565
Natural gas [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	715
Coal [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	175
Coal [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	89
Coal [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	86
Other [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	113
Other [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	53
Other [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 26