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Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses | $ (1,023) | $ (953) | $ (964) | $ (918) | $ (950) | $ (842) | $ (900) | $ (1,057) | $ (3,858) | $ (3,749) | $ (3,962)
Interest expense - other |  |  |  |  |  |  |  |  | (1,157) | (1,132) | (1,081)
Total before taxes |  |  |  |  |  |  |  |  | (9,232) | 893 | 171
Income taxes (benefits) | 3,389 | (251) | 130 | (213) | 170 | (226) | (115) | (144) | 3,055 | (315) | 42
NET INCOME (LOSS) | (5,796) | 380 | (1,089) | 328 | (226) | 395 | 187 | 222 | (6,177) | 578 | 299
FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses | (352) | (316) | (369) | (240) | (312) | (246) | (337) | (413) | (1,277) | (1,308) | (1,635)
Total before taxes |  |  |  |  |  |  |  |  | (8,443) | 147 | (588)
Income taxes (benefits) | 2,983 | (56) | 143 | (82) | (1) | (70) | 4 | 2 | 2,988 | (65) | 228
NET INCOME (LOSS) | $ (5,188) | $ 40 | $ (438) | $ 131 | $ (14) | $ 120 | $ (21) | $ (3) | (5,455) | 82 | (244)
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total before taxes |  |  |  |  |  |  |  |  | 8 | 5 | (2)
Income taxes (benefits) |  |  |  |  |  |  |  |  | (3) | (1) | 1
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 5 | 4 | (1)
Reclassifications from AOCI | Gains & losses on cash flow hedges | FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income taxes (benefits) |  |  |  |  |  |  |  |  | 0 | 1 | 4
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 0 | (2) | (6)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 0 | (3) | (10)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts | FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 0 | (3) | (10)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense - other |  |  |  |  |  |  |  |  | 8 | 8 | 8
Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | (51) | (25) | (63)
Income taxes (benefits) |  |  |  |  |  |  |  |  | 19 | 9 | 24
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (32) | (16) | (39)
Reclassifications from AOCI | Unrealized gains on AFS securities | FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | (48) | (24) | (59)
Income taxes (benefits) |  |  |  |  |  |  |  |  | 18 | 9 | 22
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (30) | (15) | (37)
Reclassifications from AOCI | Defined benefit pension and OPEB plans |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prior-service costs |  |  |  |  |  |  |  |  | (72) | (126) | (168)
Income taxes (benefits) |  |  |  |  |  |  |  |  | 27 | 49 | 65
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (45) | (77) | (103)
Reclassifications from AOCI | Defined benefit pension and OPEB plans | FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prior-service costs |  |  |  |  |  |  |  |  | (14) | (16) | (19)
Income taxes (benefits) |  |  |  |  |  |  |  |  | 5 | 6 | 7
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | $ (9) | $ (10) | $ (12)

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