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Discontinued Operations - Major Classes of Cash Flow Items from Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |
Income (loss) from discontinued operations | [1] | $ 32 | $ (45) | $ 1,224 | $ (97)
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs |  |  |  | 604 | 829
Unrealized (gain) loss on derivative transactions |  |  |  | (10) | 53
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  | (724) | (666) | (1,307) | (1,254)
Nuclear fuel |  |  |  | 0 | (134)
Sales of investment securities held in trusts |  |  |  | 475 | 1,257
Purchases of investment securities held in trusts |  |  |  | (508) | (1,305)
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |
Income (loss) from discontinued operations |  | $ 32 | $ (45) | 1,224 | (97)
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs |  |  |  | 47 | 157
Unrealized (gain) loss on derivative transactions |  |  |  | (10) | 53
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  |  | (15) | (178)
Nuclear fuel |  |  |  | 0 | (134)
Sales of investment securities held in trusts |  |  |  | 109 | 437
Purchases of investment securities held in trusts |  |  |  | $ (122) | $ (466)
[1] | Net of income tax benefits of $30 million and $15 million for the three months ended June 30, 2018 and 2017, respectively, and income tax benefits of $920 million and $41 million for the six months ended June 30, 2018 and 2017, respectively.

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