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Acquisitions and Dispositions (Schedule of Consolidated Statements of Income (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
East Ohio |  |  |
Business Acquisition [Line Items] |  |  |
Operating revenue | $ 729 | $ 728 | $ 677
Depreciation and amortization | 76 | 71 | 55
Other operating expenses | 444 | 428 | 397
Other income | 72 | 50 | 49
Interest and related charges | 37 | 33 | 25
Income tax expense | 53 | 86 | 87
Net income from discontinued operations | 191 | 160 | 162
DGP |  |  |
Business Acquisition [Line Items] |  |  |
Operating revenue | 220 | 114 | 69
Depreciation and amortization | 15 | 15 | 14
Impairment of assets and other charges | 219 |  |
Other operating expenses | 206 | 91 | 72
Income tax expense | (53) | 5 | (7)
Net income from discontinued operations | $ (167) | $ 3 | $ (10)

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