Supplemental Guarantor Information (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES			$ 1,031,000,000	$ 858,000,000
New Financing-
Long-term debt			503,000,000
Short-term borrowings, net				281,000,000
Redemptions and Repayments-
Long-term debt			(1,002,000,000)	(407,000,000)
Short-term borrowings, net			(44,000,000)
Common stock dividend payments			(420,000,000)	(335,000,000)
Other			(76,000,000)	(23,000,000)
Net cash used for financing activities			(1,039,000,000)	(484,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(569,000,000)	(489,000,000)	(1,018,000,000)	(997,000,000)
Proceeds from asset sales				116,000,000
Sales of investment securities held in trusts			1,703,000,000	1,915,000,000
Purchases of investment securities held in trusts			(1,807,000,000)	(1,934,000,000)
Customer acquisition costs			(2,000,000)	(105,000,000)
Other			(51,000,000)	(21,000,000)
Net cash provided from (used for) investing activities			(535,000,000)	(967,000,000)
Net change in cash and cash equivalents			(543,000,000)	(593,000,000)
Cash and cash equivalents at beginning of period			1,019,000,000	874,000,000
Cash and cash equivalents at end of period	476,000,000	281,000,000	476,000,000	281,000,000
FES Corp
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES			(329,000,000)	(223,000,000)
New Financing-
Short-term borrowings, net			453,000,000
Redemptions and Repayments-
Long-term debt			(135,000,000)
Other			(9,000,000)	(1,000,000)
Net cash used for financing activities			309,000,000	(1,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions			(6,000,000)	(4,000,000)
Loans to associated companies, net			28,000,000	332,000,000
Customer acquisition costs			(2,000,000)	(105,000,000)
Other				1,000,000
Net cash provided from (used for) investing activities			20,000,000	224,000,000
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	0	0	0
FGCO
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES			321,000,000	163,000,000
New Financing-
Long-term debt			140,000,000
Short-term borrowings, net			77,000,000	76,000,000
Redemptions and Repayments-
Long-term debt			(192,000,000)	(261,000,000)
Other			(1,000,000)
Net cash used for financing activities			24,000,000	(185,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions			(109,000,000)	(333,000,000)
Proceeds from asset sales				116,000,000
Loans to associated companies, net			(221,000,000)	241,000,000
Other			(18,000,000)	(2,000,000)
Net cash provided from (used for) investing activities			(348,000,000)	22,000,000
Net change in cash and cash equivalents			(3,000,000)	0
Cash and cash equivalents at beginning of period			9,000,000	0
Cash and cash equivalents at end of period	6,000,000	0	6,000,000	0
Nuclear Generation Corp
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES			200,000,000	287,000,000
New Financing-
Long-term debt			107,000,000
Redemptions and Repayments-
Long-term debt			(155,000,000)	(43,000,000)
Other			(1,000,000)
Net cash used for financing activities			(49,000,000)	(43,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions			(219,000,000)	(229,000,000)
Sales of investment securities held in trusts			513,000,000	957,000,000
Purchases of investment securities held in trusts			(545,000,000)	(979,000,000)
Loans to associated companies, net			100,000,000	58,000,000
Leasehold improvement payments to (from) associated companies				(51,000,000)
Net cash provided from (used for) investing activities			(151,000,000)	(244,000,000)
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	0	0	0
Eliminations
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES			(10,000,000)	(9,000,000)
Redemptions and Repayments-
Long-term debt			10,000,000	9,000,000
Net cash used for financing activities			10,000,000	9,000,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	0	0	0
FES
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES			182,000,000	218,000,000
New Financing-
Long-term debt			247,000,000
Short-term borrowings, net			530,000,000	76,000,000
Redemptions and Repayments-
Long-term debt			(472,000,000)	(295,000,000)
Other			(11,000,000)	(1,000,000)
Net cash used for financing activities			294,000,000	(220,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions			(334,000,000)	(566,000,000)
Proceeds from asset sales				116,000,000
Sales of investment securities held in trusts			513,000,000	957,000,000
Purchases of investment securities held in trusts			(545,000,000)	(979,000,000)
Loans to associated companies, net			(93,000,000)	631,000,000
Customer acquisition costs			(2,000,000)	(105,000,000)
Leasehold improvement payments to (from) associated companies				(51,000,000)
Other			(18,000,000)	(1,000,000)
Net cash provided from (used for) investing activities			(479,000,000)	2,000,000
Net change in cash and cash equivalents			(3,000,000)	0
Cash and cash equivalents at beginning of period			9,000,000	0
Cash and cash equivalents at end of period	$ 6,000,000	$ 0	$ 6,000,000	$ 0