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Acquisitions and Dispositions (Schedule of Results of Operations Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 06, 2019 | Dec. 31, 2018 | Dec. 31, 2017
East Ohio |  |  |
Business Acquisition [Line Items] |  |  |
Operating revenue | $ 594 | $ 729 | $ 728
Depreciation and amortization | 73 | 76 | 71
Other operating expenses | 399 | 444 | 428
Other income | 61 | 72 | 50
Interest and related charges | 33 | 37 | 33
Income tax expense (benefit) | 26 | 53 | 86
Net income (loss) from discontinued operations | 124 | 191 | 160
DGP |  |  |
Business Acquisition [Line Items] |  |  |
Operating revenue | 125 | 220 | 114
Depreciation and amortization | 4 | 15 | 15
Impairment of assets and other charges |  | 219 |
Other operating expenses | 97 | 206 | 91
Income tax expense (benefit) | 7 | (53) | 5
Net income (loss) from discontinued operations | $ 17 | $ (167) | $ 3

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