Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	$ 385	$ 426
Other comprehensive income before reclassifications	15	14
Amounts reclassified from AOCI	(39)	(35)
Net other comprehensive income (loss)	(24)	(21)
AOCI Ending Balance	361	405
FES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	72	76
Other comprehensive income before reclassifications	14	9
Amounts reclassified from AOCI	(15)	(11)
Net other comprehensive income (loss)	(1)	(2)
AOCI Ending Balance	71	74
Gains & Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	(38)	(39)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from AOCI	1	(3)
Net other comprehensive income (loss)	1	(3)
AOCI Ending Balance	(37)	(42)
Gains & Losses on Cash Flow Hedges | FES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	3	8
Other comprehensive income before reclassifications	0	0
Amounts reclassified from AOCI	(1)	(4)
Net other comprehensive income (loss)	(1)	(4)
AOCI Ending Balance	2	4
Unrealized Gains on AFS Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	15	19
Other comprehensive income before reclassifications	15	9
Amounts reclassified from AOCI	(12)	(3)
Net other comprehensive income (loss)	3	6
AOCI Ending Balance	18	25
Unrealized Gains on AFS Securities | FES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	13	16
Other comprehensive income before reclassifications	14	9
Amounts reclassified from AOCI	(10)	(3)
Net other comprehensive income (loss)	4	6
AOCI Ending Balance	17	22
Defined Benefit Pension & OPEB Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	408	446
Other comprehensive income before reclassifications	0	5
Amounts reclassified from AOCI	(28)	(29)
Net other comprehensive income (loss)	(28)	(24)
AOCI Ending Balance	380	422
Defined Benefit Pension & OPEB Plans | FES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	56	52
Other comprehensive income before reclassifications	0	0
Amounts reclassified from AOCI	(4)	(4)
Net other comprehensive income (loss)	(4)	(4)
AOCI Ending Balance	$ 52	$ 48