Accumulated Other Comprehensive Income (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other operating expenses	$ 877		$ 861		$ 2,645		$ 2,597
Interest expense	257		230		771		750
Investment income (loss)	(5)		(39)		(8)		(63)
Total before taxes	(286)		(729)		(362)		(1,558)
Income taxes (benefits)	77		307		129		650
Net of tax	(218)		(425)		(250)		(919)
FES
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other operating expenses	339		342		1,105		1,028
Investment income (loss)	3		(38)		4		(50)
Total before taxes	(56)		(161)		62		(350)
Income taxes (benefits)	23		65		(19)		139
Net of tax	(40)		(101)		29		(222)
Reclassifications from AOCI | Gains & losses on cash flow hedges
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Total before taxes	2	[1]	0	[1]	4	[1]	(1)	[1]
Income taxes (benefits)	(1)	[1]	0	[1]	(2)	[1]	0	[1]
Net of tax	1	[1]	0	[1]	2	[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					(3)	[1]	(6)	[1]
Income taxes (benefits)	1	[1]	1	[1]	1	[1]	2	[1]
Net of tax	0	[1]	(1)	[1]	(2)	[1]	(4)	[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]	(2)	[1]	(5)	[1]	(7)	[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]	(2)	[1]	(5)	[1]	(6)	[1]
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	3	[1]	2	[1]	9	[1]	6	[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 (loss)	(2)	[1]	(40)	[1]	(27)	[1]	(48)	[1]
Income taxes (benefits)	1	[1]	15	[1]	10	[1]	18	[1]
Net of tax	(1)	[1]	(25)	[1]	(17)	[1]	(30)	[1]
Reclassifications from AOCI | Unrealized gains on AFS securities | FES
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Investment income (loss)	(2)	[1]	(40)	[1]	(24)	[1]	(46)	[1]
Income taxes (benefits)	1	[1]	15	[1]	9	[1]	17	[1]
Net of tax	(1)	[1]	(25)	[1]	(15)	[1]	(29)	[1]
Reclassifications from AOCI | Defined benefit pension and OPEB plans
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Prior-service costs	(47)	[1],[2]	(47)	[1],[2]	(148)	[1],[2]	(143)	[1],[2]
Income taxes (benefits)	18	[1]	25	[1]	58	[1]	71	[1]
Net of tax	(29)	[1]	(22)	[1]	(90)	[1]	(72)	[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]	(16)	[1],[2]	(15)	[1],[2]
Income taxes (benefits)	2	[1]	2	[1]	6	[1]	5	[1]
Net of tax	$ (3)	[1]	$ (3)	[1]	$ (10)	[1]	$ (10)	[1]

[1] Parenthesis represent credits from AOCI to the Consolidated Statements of Income.

[2] These AOCI components are included in the computation of net periodic pension cost. See Note 5, Pensions and Other Postemployment Benefits for additional details.