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Fair Value Measurements (Details) (Recurring, USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets    
Fair value, assets $ 2,981 $ 2,863
Liabilities    
Fair value, liabilities (706) (619)
Net assets (liabilities) 2,275 [1] 2,244 [1]
FES
    
Assets    
Fair value, assets 1,631 1,530
Liabilities    
Fair value, liabilities (347) (241)
Net assets (liabilities) 1,284 [2] 1,289 [2]
JCP&L
    
Assets    
Fair value, assets 424 414
Liabilities    
Fair value, liabilities (136) (147)
Net assets (liabilities) 288 [3] 267 [3]
OE
    
Assets    
Fair value, assets 136 [4] 137 [4]
Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (349) (247)
Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (342) (234)
FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (15) (23)
FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (5) (7)
Non Utility Generation contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (342) [5] (349) [5]
Non Utility Generation contract | Derivative Liabilities | JCP&L
    
Liabilities    
Fair value, liabilities (136) [6] (147) [6]
Corporate debt securities
    
Assets    
Fair value, assets 1,561 1,544
Corporate debt securities | FES
    
Assets    
Fair value, assets 1,017 1,010
Corporate debt securities | JCP&L
    
Assets    
Fair value, assets 148 144
Corporate debt securities | OE
    
Assets    
Fair value, assets 0 3
Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 416 264
Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 392 248
FTRs | Derivative Assets
    
Assets    
Fair value, assets 1 1
FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 1 1
Non Utility Generation contract | Derivative Assets
    
Assets    
Fair value, assets 42 [5] 56 [5]
Non Utility Generation contract | Derivative Assets | JCP&L
    
Assets    
Fair value, assets 4 [6] 4 [6]
Equity securities
    
Assets    
Fair value, assets 289 [7] 259 [7]
Equity securities | FES
    
Assets    
Fair value, assets 150 [8] 124 [8]
Equity securities | JCP&L
    
Assets    
Fair value, assets 31 [7] 30 [7]
Foreign government debt securities
    
Assets    
Fair value, assets 0 3
Foreign government debt securities | FES
    
Assets    
Fair value, assets 0 3
U.S. government debt securities
    
Assets    
Fair value, assets 138 148
U.S. government debt securities | FES
    
Assets    
Fair value, assets 5 7
U.S. government debt securities | JCP&L
    
Assets    
Fair value, assets 0 2
U.S. government debt securities | OE
    
Assets    
Fair value, assets 133 132
U.S. state debt securities
    
Assets    
Fair value, assets 313 314
U.S. state debt securities | FES
    
Assets    
Fair value, assets 0 5
U.S. state debt securities | JCP&L
    
Assets    
Fair value, assets 225 219
Other
    
Assets    
Fair value, assets 221 [9] 274 [9]
Other | FES
    
Assets    
Fair value, assets 66 [9] 132 [9]
Other | JCP&L
    
Assets    
Fair value, assets 16 [9] 15 [9]
Other | OE
    
Assets    
Fair value, assets 3 [9] 2 [9]
Level 1
    
Assets    
Fair value, assets 344 308
Liabilities    
Fair value, liabilities (2) 0
Net assets (liabilities) 342 [1] 308 [1]
Level 1 | FES
    
Assets    
Fair value, assets 151 124
Liabilities    
Fair value, liabilities (2) 0
Net assets (liabilities) 149 [2] 124 [2]
Level 1 | JCP&L
    
Assets    
Fair value, assets 31 30
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 31 [3] 30 [3]
Level 1 | OE
    
Assets    
Fair value, assets 0 [4] 0 [4]
Level 1 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (2) 0
Level 1 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (2) 0
Level 1 | FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Level 1 | FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities 0 0
Level 1 | Non Utility Generation contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 [5] 0 [5]
Level 1 | Non Utility Generation contract | Derivative Liabilities | JCP&L
    
Liabilities    
Fair value, liabilities 0 [6] 0 [6]
Level 1 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
Level 1 | Corporate debt securities | FES
    
Assets    
Fair value, assets 0 0
Level 1 | Corporate debt securities | JCP&L
    
Assets    
Fair value, assets 0 0
Level 1 | Corporate debt securities | OE
    
Assets    
Fair value, assets 0 0
Level 1 | Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 1 0
Level 1 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 1 0
Level 1 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 0 0
Level 1 | FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 0 0
Level 1 | Non Utility Generation contract | Derivative Assets
    
Assets    
Fair value, assets 0 [5] 0 [5]
Level 1 | Non Utility Generation contract | Derivative Assets | JCP&L
    
Assets    
Fair value, assets 0 [6] 0 [6]
Level 1 | Equity securities
    
Assets    
Fair value, assets 289 [7] 259 [7]
Level 1 | Equity securities | FES
    
Assets    
Fair value, assets 150 [8] 124 [8]
Level 1 | Equity securities | JCP&L
    
Assets    
Fair value, assets 31 [7] 30 [7]
Level 1 | Foreign government debt securities
    
Assets    
Fair value, assets 0 0
Level 1 | Foreign government debt securities | FES
    
Assets    
Fair value, assets 0 0
Level 1 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
Level 1 | U.S. government debt securities | FES
    
Assets    
Fair value, assets 0 0
Level 1 | U.S. government debt securities | JCP&L
    
Assets    
Fair value, assets 0 0
Level 1 | U.S. government debt securities | OE
    
Assets    
Fair value, assets 0 0
Level 1 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
Level 1 | U.S. state debt securities | FES
    
Assets    
Fair value, assets 0 0
Level 1 | U.S. state debt securities | JCP&L
    
Assets    
Fair value, assets 0 0
Level 1 | Other
    
Assets    
Fair value, assets 54 [9] 49 [9]
Level 1 | Other | FES
    
Assets    
Fair value, assets 0 [9] 0 [9]
Level 1 | Other | JCP&L
    
Assets    
Fair value, assets 0 [9] 0 [9]
Level 1 | Other | OE
    
Assets    
Fair value, assets 0 [9] 0 [9]
Level 2
    
Assets    
Fair value, assets 2,594 2,498
Liabilities    
Fair value, liabilities (347) (247)
Net assets (liabilities) 2,247 [1] 2,251 [1]
Level 2 | FES
    
Assets    
Fair value, assets 1,479 1,405
Liabilities    
Fair value, liabilities (340) (234)
Net assets (liabilities) 1,139 [2] 1,171 [2]
Level 2 | JCP&L
    
Assets    
Fair value, assets 389 380
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 389 [3] 380 [3]
Level 2 | OE
    
Assets    
Fair value, assets 136 [4] 137 [4]
Level 2 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (347) (247)
Level 2 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (340) (234)
Level 2 | FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Level 2 | FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities 0 0
Level 2 | Non Utility Generation contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 [5] 0 [5]
Level 2 | Non Utility Generation contract | Derivative Liabilities | JCP&L
    
Liabilities    
Fair value, liabilities 0 [6] 0 [6]
Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 1,561 1,544
Level 2 | Corporate debt securities | FES
    
Assets    
Fair value, assets 1,017 1,010
Level 2 | Corporate debt securities | JCP&L
    
Assets    
Fair value, assets 148 144
Level 2 | Corporate debt securities | OE
    
Assets    
Fair value, assets 0 3
Level 2 | Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 415 264
Level 2 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 391 248
Level 2 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 0 0
Level 2 | FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 0 0
Level 2 | Non Utility Generation contract | Derivative Assets
    
Assets    
Fair value, assets 0 [5] 0 [5]
Level 2 | Non Utility Generation contract | Derivative Assets | JCP&L
    
Assets    
Fair value, assets 0 [6] 0 [6]
Level 2 | Equity securities
    
Assets    
Fair value, assets 0 [7] 0 [7]
Level 2 | Equity securities | FES
    
Assets    
Fair value, assets 0 [8] 0 [8]
Level 2 | Equity securities | JCP&L
    
Assets    
Fair value, assets 0 [7] 0 [7]
Level 2 | Foreign government debt securities
    
Assets    
Fair value, assets 0 3
Level 2 | Foreign government debt securities | FES
    
Assets    
Fair value, assets 0 3
Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 138 148
Level 2 | U.S. government debt securities | FES
    
Assets    
Fair value, assets 5 7
Level 2 | U.S. government debt securities | JCP&L
    
Assets    
Fair value, assets 0 2
Level 2 | U.S. government debt securities | OE
    
Assets    
Fair value, assets 133 132
Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 313 314
Level 2 | U.S. state debt securities | FES
    
Assets    
Fair value, assets 0 5
Level 2 | U.S. state debt securities | JCP&L
    
Assets    
Fair value, assets 225 219
Level 2 | Other
    
Assets    
Fair value, assets 167 [9] 225 [9]
Level 2 | Other | FES
    
Assets    
Fair value, assets 66 [9] 132 [9]
Level 2 | Other | JCP&L
    
Assets    
Fair value, assets 16 [9] 15 [9]
Level 2 | Other | OE
    
Assets    
Fair value, assets 3 [9] 2 [9]
Level 3
    
Assets    
Fair value, assets 43 57
Liabilities    
Fair value, liabilities (357) (372)
Net assets (liabilities) (314) [1] (315) [1]
Level 3 | FES
    
Assets    
Fair value, assets 1 1
Liabilities    
Fair value, liabilities (5) (7)
Net assets (liabilities) (4) [2] (6) [2]
Level 3 | JCP&L
    
Assets    
Fair value, assets 4 4
Liabilities    
Fair value, liabilities (136) (147)
Net assets (liabilities) (132) [3] (143) [3]
Level 3 | OE
    
Assets    
Fair value, assets 0 [4] 0 [4]
Level 3 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Level 3 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities 0 0
Level 3 | FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (15) (23)
Level 3 | FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (5) (7)
Level 3 | Non Utility Generation contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (342) [5] (349) [5]
Level 3 | Non Utility Generation contract | Derivative Liabilities | JCP&L
    
Liabilities    
Fair value, liabilities (136) [6] (147) [6]
Level 3 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
Level 3 | Corporate debt securities | FES
    
Assets    
Fair value, assets 0 0
Level 3 | Corporate debt securities | JCP&L
    
Assets    
Fair value, assets 0 0
Level 3 | Corporate debt securities | OE
    
Assets    
Fair value, assets 0 0
Level 3 | Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 0 0
Level 3 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 0 0
Level 3 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 1 1
Level 3 | FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 1 1
Level 3 | Non Utility Generation contract | Derivative Assets
    
Assets    
Fair value, assets 42 [5] 56 [5]
Level 3 | Non Utility Generation contract | Derivative Assets | JCP&L
    
Assets    
Fair value, assets 4 [6] 4 [6]
Level 3 | Equity securities
    
Assets    
Fair value, assets 0 [7] 0 [7]
Level 3 | Equity securities | FES
    
Assets    
Fair value, assets 0 [8] 0 [8]
Level 3 | Equity securities | JCP&L
    
Assets    
Fair value, assets 0 [7] 0 [7]
Level 3 | Foreign government debt securities
    
Assets    
Fair value, assets 0 0
Level 3 | Foreign government debt securities | FES
    
Assets    
Fair value, assets 0 0
Level 3 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
Level 3 | U.S. government debt securities | FES
    
Assets    
Fair value, assets 0 0
Level 3 | U.S. government debt securities | JCP&L
    
Assets    
Fair value, assets 0 0
Level 3 | U.S. government debt securities | OE
    
Assets    
Fair value, assets 0 0
Level 3 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
Level 3 | U.S. state debt securities | FES
    
Assets    
Fair value, assets 0 0
Level 3 | U.S. state debt securities | JCP&L
    
Assets    
Fair value, assets 0 0
Level 3 | Other
    
Assets    
Fair value, assets 0 [9] 0 [9]
Level 3 | Other | FES
    
Assets    
Fair value, assets 0 [9] 0 [9]
Level 3 | Other | JCP&L
    
Assets    
Fair value, assets 0 [9] 0 [9]
Level 3 | Other | OE
    
Assets    
Fair value, assets $ 0 [9] $ 0 [9]
[1] Excludes $2 million and $(52) million as of March 31, 2012 and December 31, 2011, respectively, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.
[2] Excludes $2 million and $(58) million as of March 31, 2012 and December 31, 2011, respectively, of receivables, payables, taxes and accrued income associated with the financial instruments reflected within the fair value table.
[3] Excludes $2 million as of December 31, 2011 of receivables, payables, taxes and accrued income associated with the financial instruments reflected within the fair value table.
[4] Excludes $1 million as of March 31, 2012 and December 31, 2011, respectively, of receivables, payables, taxes and accrued income associated with the financial instruments reflected within the fair value table.
[5] NUG contracts are generally subject to regulatory accounting and do not impact earnings.
[6] NUG contracts are subject to regulatory accounting and do not impact earnings.
[7] NDT funds hold equity portfolios whose performance is benchmarked against the Alerian MLP Index.
[8] NDT funds hold equity portfolios whose performance of which is benchmarked against the Alerian MLP Index.
[9] Primarily consists of short-term cash investments.