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DISCONTINUED OPERATIONS - Major Classes of Cash Flow Items from Discontinued Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Income from discontinued operations | [1] | $ 76 | $ 8 | $ 326
Gain on disposal, net of tax |  | (76) | (59) | (435)
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs |  | 1,199 | 1,217 | 1,384
Deferred income taxes and investment tax credits, net |  | 113 | 252 | 485
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |
Property additions |  | (2,657) | (2,665) | (2,675)
Sales of investment securities held in trusts |  | 186 | 1,637 | 909
Purchases of investment securities held in trusts |  | (208) | (1,675) | (963)
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |
Income from discontinued operations |  | 76 | 8 | 326
Gain on disposal, net of tax |  | (76) | (59) | (435)
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs |  | 0 | 0 | 110
Deferred income taxes and investment tax credits, net |  | 0 | 47 | 61
Unrealized (gain) loss on derivative transactions |  | 0 | 0 | (10)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |
Property additions |  | 0 | 0 | (27)
Sales of investment securities held in trusts |  | 0 | 0 | 109
Purchases of investment securities held in trusts |  | $ 0 | $ 0 | $ (122)
[1] | Net of income tax benefit of $59 million, $5 million, and $1.3 billion in 2020, 2019 and 2018, respectively.

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