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Acquisitions and Dispositions (Schedule of Capital expenditures and significant noncash) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant noncash items |  |  |
Accrued capital expenditures | $ 307 | $ 343 | $ 427
East Ohio |  |  |
Business Acquisition [Line Items] |  |  |
Capital expenditures | 352 | 348 | 352
Significant noncash items |  |  |
Accrued capital expenditures | 5 | 8 | 17
DGP |  |  |
Business Acquisition [Line Items] |  |  |
Capital expenditures | 6 | $ 8 | $ 6
Significant noncash items |  |  |
Accrued capital expenditures | $ 219 |  |

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