Supplemental Guarantor Information (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES	$ 3,063,000,000	$ 3,076,000,000	$ 2,465,000,000
New Financing-
Long-term debt	604,000,000	1,099,000,000	4,632,000,000
Redemptions and Repayments-
Long-term debt	(1,909,000,000)	(1,015,000,000)	(2,610,000,000)
Short-term borrowings, net	(700,000,000)	(378,000,000)	(1,246,000,000)
Common stock dividend payments	(881,000,000)	(670,000,000)	(670,000,000)
Other	(38,000,000)	(19,000,000)	(57,000,000)
Net cash provided from (used for) financing activities	(2,924,000,000)	(983,000,000)	49,000,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(2,278,000,000)	(1,963,000,000)	(2,203,000,000)
Proceeds from asset sales	840,000,000	117,000,000	21,000,000
Sales of investment securities held in trusts	4,207,000,000	3,172,000,000	2,229,000,000
Purchases of investment securities held in trusts	(4,309,000,000)	(3,219,000,000)	(2,306,000,000)
Customer acquisition costs	(3,000,000)	(113,000,000)	0
Other	51,000,000	27,000,000	55,000,000
Net cash provided from (used for) investing activities	(956,000,000)	(1,948,000,000)	(2,185,000,000)
Net change in cash and cash equivalents	(817,000,000)	145,000,000	329,000,000
Cash and cash equivalents at beginning of period	1,019,000,000	874,000,000	545,000,000
Cash and cash equivalents at end of period	202,000,000	1,019,000,000	874,000,000
FES Corp
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES	(790,000,000)	(260,000,000)	(20,000,000)
New Financing-
Long-term debt	0	0	1,498,000,000
Equity contributions from parent			0
Short-term borrowings, net	1,065,000,000	0
Redemptions and Repayments-
Long-term debt	(136,000,000)	(1,000,000)	(2,000,000)
Short-term borrowings, net	0		(901,000,000)
Other	(9,000,000)	0	(12,000,000)
Net cash provided from (used for) financing activities	920,000,000	(1,000,000)	583,000,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(24,000,000)	(9,000,000)	(4,000,000)
Proceeds from asset sales	9,000,000	0	0
Sales of investment securities held in trusts	0	0	0
Purchases of investment securities held in trusts	0	0	0
Loans to affiliated companies, net	(120,000,000)	382,000,000	(309,000,000)
Customer acquisition costs	(3,000,000)	(113,000,000)
Investment in subsidiary		0	(250,000,000)
Other	8,000,000	1,000,000	0
Net cash provided from (used for) investing activities	(130,000,000)	261,000,000	(563,000,000)
Net change in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
FGCO
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES	926,000,000	380,000,000	790,000,000
New Financing-
Long-term debt	140,000,000	318,000,000	577,000,000
Equity contributions from parent			100,000,000
Short-term borrowings, net	78,000,000	2,000,000
Redemptions and Repayments-
Long-term debt	(362,000,000)	(341,000,000)	(321,000,000)
Short-term borrowings, net	0		(248,000,000)
Other	(1,000,000)	(1,000,000)	(6,000,000)
Net cash provided from (used for) financing activities	(145,000,000)	(22,000,000)	102,000,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(205,000,000)	(518,000,000)	(672,000,000)
Proceeds from asset sales	590,000,000	117,000,000	18,000,000
Sales of investment securities held in trusts	0	0	0
Purchases of investment securities held in trusts	0	0	0
Loans to affiliated companies, net	(1,157,000,000)	52,000,000	(219,000,000)
Customer acquisition costs	0	0
Investment in subsidiary		0	0
Other	(11,000,000)	0	(19,000,000)
Net cash provided from (used for) investing activities	(783,000,000)	(349,000,000)	(892,000,000)
Net change in cash and cash equivalents	(2,000,000)	9,000,000	0
Cash and cash equivalents at beginning of period	9,000,000	0	0
Cash and cash equivalents at end of period	7,000,000	9,000,000	0
Nuclear Generation Corp
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES	702,000,000	685,000,000	622,000,000
New Financing-
Long-term debt	107,000,000	397,000,000	363,000,000
Equity contributions from parent			150,000,000
Short-term borrowings, net	32,000,000	0
Redemptions and Repayments-
Long-term debt	(377,000,000)	(449,000,000)	(404,000,000)
Short-term borrowings, net	0		(7,000,000)
Other	(1,000,000)	(1,000,000)	(3,000,000)
Net cash provided from (used for) financing activities	(239,000,000)	(53,000,000)	99,000,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(520,000,000)	(508,000,000)	(547,000,000)
Proceeds from asset sales	0	0	0
Sales of investment securities held in trusts	1,843,000,000	1,927,000,000	1,379,000,000
Purchases of investment securities held in trusts	(1,890,000,000)	(1,974,000,000)	(1,406,000,000)
Loans to affiliated companies, net	105,000,000	(26,000,000)	(148,000,000)
Customer acquisition costs	0	0
Investment in subsidiary		(51,000,000)	0
Other	(1,000,000)	0	1,000,000
Net cash provided from (used for) investing activities	(463,000,000)	(632,000,000)	(721,000,000)
Net change in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
Eliminations
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES	(19,000,000)	(19,000,000)	(18,000,000)
New Financing-
Long-term debt	0	0	0
Equity contributions from parent			(250,000,000)
Short-term borrowings, net	(1,186,000,000)	0
Redemptions and Repayments-
Long-term debt	19,000,000	19,000,000	18,000,000
Short-term borrowings, net	0		0
Other	0	0	0
Net cash provided from (used for) financing activities	(1,167,000,000)	19,000,000	(232,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	0	0	0
Proceeds from asset sales	0	0	0
Sales of investment securities held in trusts	0	0	0
Purchases of investment securities held in trusts	0	0	0
Loans to affiliated companies, net	1,186,000,000	0	0
Customer acquisition costs	0	0
Investment in subsidiary		0	250,000,000
Other	0	0	0
Net cash provided from (used for) investing activities	1,186,000,000	0	250,000,000
Net change in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
FES
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED FROM (USED FOR) OPERATING ACTIVITIES	819,000,000	786,000,000	1,374,000,000
New Financing-
Long-term debt	247,000,000	715,000,000	2,438,000,000
Equity contributions from parent			0
Short-term borrowings, net	(11,000,000)	2,000,000	0
Redemptions and Repayments-
Long-term debt	(856,000,000)	(772,000,000)	(709,000,000)
Short-term borrowings, net	0	0	(1,156,000,000)
Other	(11,000,000)	(2,000,000)	(21,000,000)
Net cash provided from (used for) financing activities	(631,000,000)	(57,000,000)	552,000,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(749,000,000)	(1,035,000,000)	(1,223,000,000)
Proceeds from asset sales	599,000,000	117,000,000	18,000,000
Sales of investment securities held in trusts	1,843,000,000	1,927,000,000	1,379,000,000
Purchases of investment securities held in trusts	(1,890,000,000)	(1,974,000,000)	(1,406,000,000)
Loans to affiliated companies, net	14,000,000	408,000,000	(676,000,000)
Customer acquisition costs	(3,000,000)	(113,000,000)	0
Leasehold improvement payments to (from) associated companies	0	(51,000,000)	0
Investment in subsidiary		(51,000,000)	0
Other	(4,000,000)	1,000,000	(18,000,000)
Net cash provided from (used for) investing activities	(190,000,000)	(720,000,000)	(1,926,000,000)
Net change in cash and cash equivalents	(2,000,000)	9,000,000	0
Cash and cash equivalents at beginning of period	9,000,000	0	0
Cash and cash equivalents at end of period	$ 7,000,000	$ 9,000,000	$ 0