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Cumulative Preferred Stock of Subsidiaries (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
IPL Subsidiary [Member]
 
Temporary Equity [Line Items]  
Temporary Equity Carrying amount $ 60
Temporary Equity Annual Dividend Requirement 3
IPL Subsidiary [Member] | Minimum
 
Temporary Equity [Line Items]  
Temporary Equity, Redemption Price Per Share $ 100
IPL Subsidiary [Member] | Maximum
 
Temporary Equity [Line Items]  
Temporary Equity, Redemption Price Per Share $ 118
DPL Subsidiary [Member]
 
Temporary Equity [Line Items]  
Temporary Equity Carrying amount 18
Temporary Equity Annual Dividend Requirement $ 1
DPL Subsidiary [Member] | Minimum
 
Temporary Equity [Line Items]  
Temporary Equity, Redemption Price Per Share $ 101
DPL Subsidiary [Member] | Maximum
 
Temporary Equity [Line Items]  
Temporary Equity, Redemption Price Per Share $ 103