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Summary of Quarterly Financial Data (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Data [Line Items]                      
Revenues $ 3,500 [1] $ 4,059 [1] $ 3,754 [1] $ 3,990 [1] $ 3,860 [1] $ 4,674 [1] $ 4,037 [1] $ 3,576 [1] $ 9,637 $ 10,400 $ 9,820
Other operating expenses 1,165 865 921 818 928 997 1,066 973 3,769 3,964 2,714
Pension and OPEB mark-to-market adjustment 609 0 0 0 507 0 0 0 609 507 190
Provision for depreciation 287 273 285 279 283 284 279 220 1,124 1,066 750
Impairment of long-lived assets 0 0 0 0 372 9 7 25 0 413 388
Operating Income (34) 907 557 746 (230) 1,057 521 350 2,176 1,698 1,743
Income before income taxes (253) 734 315 528 123 855 307 158      
Total provision for income taxes (105) 309 127 222 24 325 114 111 553 574 462
Net income (loss) (148) 425 188 306 99 530 193 47 771 869 718
Earnings available to Parent (148) 425 187 306 98 532 203 52 770 885 742
Earnings per share of common stock-                      
Basic earnings per share of common stock (in dollars per share) $ (0.35) $ 1.02 $ 0.45 $ 0.73 $ 0.23 $ 1.27 $ 0.48 $ 0.15 $ 1.85 $ 2.22 $ 2.44
Diluted earnings per share of common stock (in dollars per share) $ (0.35) $ 1.01 $ 0.45 $ 0.73 $ 0.23 $ 1.27 $ 0.48 $ 0.15 $ 1.84 $ 2.21 $ 2.42
FES
                      
Quarterly Financial Data [Line Items]                      
Revenues 1,389 1,557 1,456 1,516 1,327 1,467 1,292 1,391 5,918 5,477 5,828
Other operating expenses 329 343 393 295 347 390 413 480 1,360 1,630 1,230
Pension and OPEB mark-to-market adjustment 166 0 0 0 171 0 0 0 166 171 107
Provision for depreciation 73 71 69 63 68 69 69 69 276 275 246
Impairment of long-lived assets 0 0 0 0 271 2 7 14      
Operating Income (51) 175 15 222 (340) 206 63 90 361 19 404
Income before income taxes (69) 169 0 198 (378) 198 39 71      
Total provision for income taxes (34) 68 1 76 (125) 78 10 26 111 (11) 125
Net income (loss) (35) 101 (1) 122 (253) 120 29 45 187 (59) 231
OE
                      
Quarterly Financial Data [Line Items]                      
Revenues 387 454 388 386 386 470 385 392 1,615 1,633 1,836
Other operating expenses 127 124 119 121 135 114 106 96 491 451 342
Pension and OPEB mark-to-market adjustment 84 0 0 0 43 0 0 0 84 43 24
Provision for depreciation 26 26 25 24 24 23 23 23 101 93 91
Operating Income (5) 93 79 69 23 99 76 69 236 267 295
Income before income taxes (17) 78 62 52 7 88 59 52      
Total provision for income taxes (2) 34 21 21 6 34 18 20 74 78 78
Net income (loss) (15) 44 41 31 1 54 41 32 101 128 155
JCP&L
                      
Quarterly Financial Data [Line Items]                      
Revenues 419 636 484 488 483 777 588 647 2,027 2,495 3,027
Other operating expenses 339 90 86 84 114 132 76 81 599 403 329
Pension and OPEB mark-to-market adjustment 65 0 0 0 60 0 0 0 65 60 26
Provision for depreciation 28 27 27 27 26 27 25 25 109 103 107
Operating Income 13 169 97 78 24 173 104 71 357 372 443
Income before income taxes (16) 139 69 48 (5) 146 77 43      
Total provision for income taxes (7) 62 30 22 4 61 32 20 107 117 147
Net income (loss) $ (9) $ 77 $ 39 $ 26 $ (9) $ 85 $ 45 $ 23 $ 133 $ 144 $ 183
[1] Reflects reclassification of revenues and purchased power costs from amounts previously reported to reflect the impact of netting transactions for FES and AE Supply on an hourly basis. This reclassification had no impact on net income or cash flows.