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Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | $ (957) | $ (964) | $ (2,099) | $ (1,882)
Interest expense | (290) | (289) | (577) | (577)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) | 291 | (1,219) | 622 | (678)
Income taxes (benefits) | (117) | 130 | (243) | (83)
Prior-service costs | 23 | 28 | 54 | 57
Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (1) | (2) | (4) | (4)
Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | 6 | 12 | 22 | 25
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income taxes (benefits) | (1) | (1) | (2) | (2)
Net of tax | 0 | 1 | 2 | 2
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | 1 | 2 | 4 | 4
Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment income (loss) | (6) | (12) | (22) | (25)
Income taxes (benefits) | 2 | 4 | 8 | 9
Net of tax | (4) | (8) | (14) | (16)
Reclassifications from AOCI | Net prior service costs |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (18) | (18) | (36) | (36)
Income taxes | 8 | 7 | 14 | 14
Net of tax | (10) | (11) | (22) | (22)
FES |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | (286) | (369) | (804) | (609)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) | 42 | (581) | (79) | (368)
Income taxes (benefits) | (23) | 143 | 18 | 61
Prior-service costs | 10 | 15 | 28 | 32
FES | Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | 0 | 1 | 0 | 1
FES | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | 6 | 11 | 21 | 24
FES | Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income taxes (benefits) | 0 | 0 | 0 | 0
Net of tax | 0 | (1) | 0 | (1)
FES | Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | 0 | (1) | 0 | (1)
FES | Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment income (loss) | (6) | (11) | (21) | (24)
Income taxes (benefits) | 2 | 4 | 8 | 9
Net of tax | (4) | (7) | (13) | (15)
FES | Reclassifications from AOCI | Net prior service costs |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (4) | (3) | (7) | (7)
Income taxes | 2 | 1 | 3 | 3
Net of tax | $ (2) | $ (2) | $ (4) | $ (4)

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