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Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Other operating expenses | $ (1,142) | $ (918)
Interest expense | (287) | (288)
INCOME BEFORE INCOME TAXES | 331 | 541
Income taxes (benefits) | (126) | (213)
Prior-service costs | 31 | 29
Gains & losses on cash flow hedges |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Prior-service costs | (3) | (2)
Unrealized gains on AFS securities |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Prior-service costs | 16 | 13
Defined Benefit Pension & OPEB Plans |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Prior-service costs | 18 | 18
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
INCOME BEFORE INCOME TAXES | 3 | 2
Income taxes (benefits) | (1) | (1)
Net of tax | 2 | 1
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Other operating expenses | 0 | 0
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense | 3 | 2
Reclassifications from AOCI | Unrealized gains on AFS securities |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Investment income (loss) | (16) | (13)
Income taxes (benefits) | 6 | 5
Net of tax | (10) | (8)
Reclassifications from AOCI | Net prior service costs |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Prior-service costs | (18) | (18)
Income taxes | 6 | 7
Net of tax | (12) | (11)
FES |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Other operating expenses | (518) | (240)
INCOME BEFORE INCOME TAXES | (121) | 213
Income taxes (benefits) | 41 | (82)
Prior-service costs | 18 | 17
FES | Gains & losses on cash flow hedges |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Prior-service costs | 0 | 0
FES | Unrealized gains on AFS securities |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Prior-service costs | 15 | 13
FES | Defined Benefit Pension & OPEB Plans |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Prior-service costs | 3 | 4
FES | Reclassifications from AOCI | Gains & losses on cash flow hedges |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Income taxes (benefits) | 0 | 0
Net of tax | 0 | 0
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 | 0
FES | Reclassifications from AOCI | Unrealized gains on AFS securities |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Investment income (loss) | (15) | (13)
Income taxes (benefits) | 6 | 5
Net of tax | (9) | (8)
FES | Reclassifications from AOCI | Net prior service costs |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Prior-service costs | (3) | (4)
FES | Reclassifications from AOCI | Defined Benefit Pension & OPEB Plans |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Income taxes | 1 | 2
Net of tax | $ (2) | $ (2)

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