Debt (Schedule Of Debt-To-Capital Ratios) (Details)	Dec. 31, 2013
Actual	51.00%
IPL [Member]
Actual	45.00%
WPL [Member]
Actual	50.00%
Maximum [Member]
Requirement	65.00%
Maximum [Member] | IPL [Member]
Requirement	58.00%
Maximum [Member] | WPL [Member]
Requirement	58.00%