Commitments And Contingencies (Other Purchase Commitments) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Commitments and Contingencies [Line Items]
Minimum future commitments	$ 1,658
Individual commitments incurred	1
IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	820
Individual commitments incurred	1
WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	809
Individual commitments incurred	1
Natural gas [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	1,396
Natural gas [Member] | IPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	691
Natural gas [Member] | WPL [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	705
Coal [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	148
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	76
Other [Member]
Commitments and Contingencies [Line Items]
Minimum future commitments	114
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