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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of company's ARO obligations and related additions, reductions and accretion | The following table represents the balance of ARO obligations as of December 31, 2017 and 2016, along with the additions, reductions and accretion related to the Company's ARO obligations for the year ended December 31, 2017:
| (In millions)
Balance as of December 31, 2016 | $ | 735 |
Revisions in estimates for current obligations | (3 | )
Additions | 9 |
Spending for current obligations | (21 | )
Accretion — Expense | 35 |
Accretion — Nuclear decommissioning | 16 |
Balance as of December 31, 2017 | $ | 771 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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