Accumulated Other Comprehensive Income (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other operating expenses	$ 887		$ 921		$ 1,771		$ 1,739
Interest expense	256		274		514		520
Investment income	15		(13)		(3)		(24)
Total before taxes	222		(315)		(90)		(843)
Income taxes (benefits)	(58)		127		58		349
Net of tax	164		(188)		(32)		(494)
FES
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other operating expenses	388		393		768		688
Investment income	18		(6)		1		(12)
Total before taxes	112		0		108		(198)
Income taxes (benefits)	(41)		1		(39)		77
Net of tax	71		1		69		(121)
Reclassifications from AOCI | Gains & losses on cash flow hedges
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Total before taxes	1	[1]	3	[1]	2	[1]	(1)	[1]
Income taxes (benefits)	1	[1]	1	[1]	1	[1]	0	[1]
Net of tax	0	[1]	2	[1]	1	[1]	(1)	[1]
Reclassifications from AOCI | Gains & losses on cash flow hedges | FES
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Total before taxes					(2)	[1]	(4)	[1]
Income taxes (benefits)	0	[1]	0	[1]	0	[1]	(1)	[1]
Net of tax	(1)	[1]	1	[1]	(2)	[1]	(3)	[1]
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other operating expenses	(1)	[1]	1	[1]	(4)	[1]	(5)	[1]
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts | FES
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other operating expenses	(1)	[1]	1	[1]	(4)	[1]	(4)	[1]
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	2	[1]	2	[1]	6	[1]	4	[1]
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt | FES
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest expense					2	[1]	0	[1]
Reclassifications from AOCI | Unrealized gains on AFS securities
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Investment income	(6)	[1]	(3)	[1]	(25)	[1]	(8)	[1]
Income taxes (benefits)	(2)	[1]	(1)	[1]	(9)	[1]	(3)	[1]
Net of tax	(4)	[1]	(2)	[1]	(16)	[1]	(5)	[1]
Reclassifications from AOCI | Unrealized gains on AFS securities | FES
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Investment income	(6)	[1]	(2)	[1]	(22)	[1]	(6)	[1]
Income taxes (benefits)	(2)	[1]	(1)	[1]	(8)	[1]	(2)	[1]
Net of tax	(4)	[1]	(1)	[1]	(14)	[1]	(4)	[1]
Reclassifications from AOCI | Defined benefit pension and OPEB plans
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Prior-service costs	(55)	[1],[2]	(48)	[1],[2]	(101)	[1],[2]	(96)	[1],[2]
Income taxes (benefits)	(22)	[1]	(27)	[1]	(40)	[1]	(46)	[1]
Net of tax	(33)	[1]	(21)	[1]	(61)	[1]	(50)	[1]
Reclassifications from AOCI | Defined benefit pension and OPEB plans | FES
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Prior-service costs	(5)	[1],[2]	(5)	[1],[2]	(11)	[1],[2]	(10)	[1],[2]
Income taxes (benefits)	(2)	[1]	(2)	[1]	(4)	[1]	(3)	[1]
Net of tax	$ (3)	[1]	$ (3)	[1]	$ (7)	[1]	$ (7)	[1]

[1] Parenthesis represent credits from AOCI

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 3, Pensions and Other Postemployment Benefits for additional details.