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Discontinued Operations - Major Classes of Cash Flow Items from Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Income (loss) from discontinued operations | [1] | $ (35) | $ 1,188
Depreciation and amortization, including regulatory assets, net, intangible assets and deferred debt-related costs |  | 345 | 280
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property additions |  | (554) | (583)
Sales of investment securities held in trusts |  | 153 | 300
Purchases of investment securities held in trusts |  | (162) | (322)
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Income (loss) from discontinued operations |  | (35) | 1,188
Depreciation and amortization, including regulatory assets, net, intangible assets and deferred debt-related costs |  | 0 | 64
Unrealized gain on derivative transactions |  | 0 | (10)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property additions |  | 0 | (16)
Sales of investment securities held in trusts |  | 0 | 109
Purchases of investment securities held in trusts |  | $ 0 | $ (122)
[1] | Net of income tax expense (benefits) of $5 million and $(871) million for the three months ended March 31, 2019 and 2018, respectively.

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