Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	$ 284	$ 385
Other comprehensive income (loss) before reclassifications	22	15
Amounts reclassified from AOCI	(35)	(39)
Net other comprehensive income (loss)	(13)	(24)
AOCI Ending Balance	271	361
FES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	54	72
Other comprehensive income (loss) before reclassifications	21	14
Amounts reclassified from AOCI	(13)	(15)
Net other comprehensive income (loss)	8	(1)
AOCI Ending Balance	62	71
Gains & Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	(36)	(38)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	0	1
Net other comprehensive income (loss)	0	1
AOCI Ending Balance	(36)	(37)
Gains & Losses on Cash Flow Hedges | FES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	(1)	3
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	(1)	(1)
Net other comprehensive income (loss)	(1)	(1)
AOCI Ending Balance	(2)	2
Unrealized Gains on AFS Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	9	15
Other comprehensive income (loss) before reclassifications	22	15
Amounts reclassified from AOCI	(9)	(12)
Net other comprehensive income (loss)	13	3
AOCI Ending Balance	22	18
Unrealized Gains on AFS Securities | FES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	8	13
Other comprehensive income (loss) before reclassifications	21	14
Amounts reclassified from AOCI	(9)	(10)
Net other comprehensive income (loss)	12	4
AOCI Ending Balance	20	17
Defined Benefit Pension & OPEB Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	311	408
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	(26)	(28)
Net other comprehensive income (loss)	(26)	(28)
AOCI Ending Balance	285	380
Defined Benefit Pension & OPEB Plans | FES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	47	56
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	(3)	(4)
Net other comprehensive income (loss)	(3)	(4)
AOCI Ending Balance	$ 44	$ 52