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Commitments And Contingencies (Operating Expense Purchase Obligations) (Details) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Commitments and Contingencies [Line Items]  
Minimum future commitments $ 2,277
Individual commitments incurred 1
IPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments 1,799
Individual commitments incurred 1
WPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments 478
Individual commitments incurred 1
DAEC (IPL) [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 1,480
DAEC (IPL) [Member] | IPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 1,480
DAEC (IPL) [Member] | WPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 0
Other [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 202
Other [Member] | IPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 1
Other [Member] | WPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 201
Purchased Power [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 1,682
Purchased Power [Member] | IPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 1,481
Purchased Power [Member] | WPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [1] 201
Natural Gas [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments 270
Natural Gas [Member] | IPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments 165
Natural Gas [Member] | WPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments 105
Coal [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [2] 279
Coal [Member] | IPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [2] 114
Coal [Member] | WPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [2] 165
SO2 emission allowances [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments 22
SO2 emission allowances [Member] | IPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments 22
SO2 emission allowances [Member] | WPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments 0
Other [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [3] 24
Other [Member] | IPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [3] 17
Other [Member] | WPL [Member]  
Commitments and Contingencies [Line Items]  
Minimum future commitments [3] $ 7
[1] Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased.
[2] Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of June 30, 2015 regarding expected future usage, which is subject to change.
[3] Includes individual commitments incurred during the normal course of business that exceeded $1 million at June 30, 2015.