Commitments And Contingencies (Other Purchase Commitments) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 1,931
Individual commitments incurred	1
IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	894
Individual commitments incurred	1
WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	996
Individual commitments incurred	1
Natural gas [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	1,608
Natural gas [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	742
Natural gas [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	866
Coal [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	197
Coal [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	95
Coal [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	102
Other [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	126
Other [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	57
Other [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 28