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Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | $ 942 | $ 953 | $ 3,041 | $ 2,835
Interest expense | 305 | 286 | 882 | 863
Income taxes (benefits) | 239 | 251 | 482 | 334
Prior-service costs | 48 | 33 | 102 | 90
Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (4) | (2) | (8) | (6)
Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | 33 | 17 | 55 | 42
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income taxes (benefits) | (1) | 0 | (3) | (2)
Net of tax | 3 | 2 | 5 | 4
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | 4 | 2 | 8 | 6
Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment income (loss) | (33) | (17) | (55) | (42)
Income taxes (benefits) | 12 | 7 | 20 | 16
Net of tax | (21) | (10) | (35) | (26)
Reclassifications from AOCI | Net prior service costs |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (19) | (18) | (55) | (54)
Income taxes | 7 | 7 | 21 | 21
Net of tax | (12) | (11) | (34) | (33)
FES |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | 291 | 316 | 1,095 | 925
Income taxes (benefits) | 32 | 56 | 14 | (5)
Prior-service costs | 35 | 19 | 63 | 51
FES | Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (1) | (1) | (1) | 0
FES | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | 33 | 17 | 54 | 41
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 | 1 | 1 | 1 | 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 | 1 | 1 | 1 | 0
FES | Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment income (loss) | (33) | (17) | (54) | (41)
Income taxes (benefits) | 11 | 6 | 19 | 15
Net of tax | (22) | (11) | (35) | (26)
FES | Reclassifications from AOCI | Net prior service costs |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (3) | (3) | (10) | (10)
Income taxes | 1 | 1 | 4 | 4
Net of tax | $ (2) | $ (2) | $ (6) | $ (6)

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