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Discontinued Operations - Major Classes of Cash Flow Items from Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |
Income from discontinued operations | [1] | $ (845) | $ 95 | $ 370 | $ 3
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs |  |  |  | 1,003 | 1,307
Unrealized (gain) loss on derivative transactions |  |  |  | (5) | 64
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  | (635) | (593) | (1,942) | (1,847)
Nuclear fuel |  |  |  | 0 | (156)
Sales of investment securities held in trusts |  |  |  | 736 | 1,923
Purchases of investment securities held in trusts |  |  |  | (780) | (1,995)
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |
Income from discontinued operations |  | $ (845) | $ 95 | 370 | 3
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs |  |  |  | 110 | 245
Unrealized (gain) loss on derivative transactions |  |  |  | (15) | 64
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |
Property additions |  |  |  | (27) | (233)
Nuclear fuel |  |  |  | 0 | (156)
Sales of investment securities held in trusts |  |  |  | 109 | 834
Purchases of investment securities held in trusts |  |  |  | $ (122) | $ (878)
[1] | Net of income tax expense (benefit) of $(354) million and $37 million for the three months ended September 30, 2018 and 2017, respectively, and income tax benefits of $(1.3) billion and $(1) million for the nine months ended September 30, 2018 and 2017, respectively.

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