Commitments And Contingencies (Other Purchase Commitments) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 1,201
Individual commitments incurred	1
IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	610
Individual commitments incurred	1
WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	558
Individual commitments incurred	1
Natural gas [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	939
Natural gas [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	472
Natural gas [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	467
Coal [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	127
Coal [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	72
Coal [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	55
Other [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	135
Other [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	66
Other [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 36