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Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | $ 964 | $ 900 | $ 1,882 | $ 1,957
Interest expense | 289 | 282 | 577 | 561
Investment income (loss) | (19) | 3 | (47) | (14)
Total before taxes | 1,219 | (302) | 678 | (668)
Income taxes (benefits) | (130) | 115 | 83 | 259
Net of tax | 1,089 | (187) | 761 | (409)
FES |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | 369 | 337 | 609 | 750
Investment income (loss) | (19) | (1) | (32) | (14)
Total before taxes | 581 | 25 | 368 | 30
Income taxes (benefits) | (143) | (4) | (61) | (6)
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before taxes | 2 | 1 | 4 | 2
Income taxes (benefits) | (1) | (1) | (2) | (1)
Net of tax | 1 | 0 | 2 | 1
Reclassifications from AOCI | Gains & losses on cash flow hedges | FES |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income taxes (benefits) | 0 | 0 | 0 | 0
Net of tax | (1) | (1) | (1) | (2)
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 | (2)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts | FES |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | (1) | (1) | (1) | (2)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | 2 | 2 | 4 | 4
Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment income (loss) | (12) | (7) | (25) | (17)
Income taxes (benefits) | 4 | 2 | 9 | 6
Net of tax | (8) | (5) | (16) | (11)
Reclassifications from AOCI | Unrealized gains on AFS securities | FES |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment income (loss) | (11) | (5) | (24) | (15)
Income taxes (benefits) | 4 | 2 | 9 | 6
Net of tax | (7) | (3) | (15) | (9)
Reclassifications from AOCI | Defined benefit pension and OPEB plans |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (18) | (32) | (36) | (63)
Income taxes (benefits) | 7 | 13 | 14 | 24
Net of tax | (11) | (19) | (22) | (39)
Reclassifications from AOCI | Defined benefit pension and OPEB plans | FES |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior-service costs | (3) | (4) | (7) | (8)
Income taxes (benefits) | 1 | 2 | 3 | 3
Net of tax | $ (2) | $ (2) | $ (4) | $ (5)

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