Derivative Instruments (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Cash Flow Hedges Derivative assets		$ 104
Cash Flow Hedges Derivative liabilities		101
Unamortized gains or losses associated with designated cash flow hedges	19
Unamortized gains or losses associated with prior interest rate hedges	79
Losses to be amortized to interest expenses during next twelve months	9
Net asset position under commodity derivative contracts	17
Potential adverse change in quoted market prices of derivative instruments	10.00%
Decrease net income due to adverse change in commodity prices	13
Period In Which LSEs May Request Direct Allocation Of FTRs	2 years
FES
Derivative [Line Items]
Collateral posted	52
Additional collateral related to commodity derivatives	28
AE Supply
Derivative [Line Items]
Collateral posted	1
Additional collateral related to commodity derivatives	2
Cash Flow Hedges
Derivative [Line Items]
Reclassifications from AOCL into other operating expense	26
Losses to be amortized to interest expenses during next twelve months	9
Reclassifications from accumulated other comprehensive loss	12	11
Fair Value Hedging
Derivative [Line Items]
Losses to be amortized to interest expenses during next twelve months	22
Gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements	102
Reclassifications from long-term debt	$ 22	$ 12