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Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses | $ (1,195) | $ (940) | $ (956) | $ (1,141) | $ (1,021) | $ (950) | $ (963) | $ (917) | $ (4,232) | $ (3,851) | $ (3,740)
Interest expense - other |  |  |  |  |  |  |  |  | (1,178) | (1,157) | (1,132)
Total before taxes |  |  |  |  |  |  |  |  | (829) | (9,232) | 893
Income taxes (benefits) | (413) | (239) | (117) | (126) | 3,389 | (251) | 130 | (213) | (895) | 3,055 | (315)
FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses | (419) | (291) | (286) | (518) | (352) | (316) | (369) | (240) | (1,514) | (1,277) | (1,308)
Total before taxes |  |  |  |  |  |  |  |  | (2,096) | (8,443) | 147
Income taxes (benefits) | $ (281) | $ (32) | $ (23) | $ 41 | $ 2,983 | $ (56) | $ 143 | $ (82) | (295) | 2,988 | (65)
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total before taxes |  |  |  |  |  |  |  |  | 10 | 8 | 5
Income taxes (benefits) |  |  |  |  |  |  |  |  | (4) | (3) | (1)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 6 | 5 | 4
Reclassifications from AOCI | Gains & losses on cash flow hedges | FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income taxes (benefits) |  |  |  |  |  |  |  |  | (1) | 0 | 1
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 1 | 0 | (2)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 2 | 0 | (3)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts | FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 2 | 0 | (3)
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 |  |  |  |  |  |  |  |  | (63) | (51) | (25)
Income taxes (benefits) |  |  |  |  |  |  |  |  | 23 | 19 | 9
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (40) | (32) | (16)
Reclassifications from AOCI | Unrealized gains on AFS securities | FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | (61) | (48) | (24)
Income taxes (benefits) |  |  |  |  |  |  |  |  | 23 | 18 | 9
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (38) | (30) | (15)
Reclassifications from AOCI | Defined benefit pension and OPEB plans |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prior-service costs |  |  |  |  |  |  |  |  | (74) | (72) | (126)
Income taxes (benefits) |  |  |  |  |  |  |  |  | 28 | 27 | 49
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (46) | (45) | (77)
Reclassifications from AOCI | Defined benefit pension and OPEB plans | FES |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prior-service costs |  |  |  |  |  |  |  |  | (14) | (14) | (16)
Income taxes (benefits) |  |  |  |  |  |  |  |  | 5 | 5 | 6
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | $ (9) | $ (9) | $ (10)

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