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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations The Company's AROs are primarily related to the environmental obligations related to nuclear decommissioning, ash disposal, site closures, and fuel storage facilities and future dismantlement of equipment on leased property. In addition, the Company has also identified conditional AROs for asbestos removal and disposal, which are specific to certain power generation operations. See Note 6, Nuclear Decommissioning Trust Fund, for a further discussion of the Company's nuclear decommissioning obligations. Accretion for the nuclear decommissioning ARO and amortization of the related ARO asset are recorded to the Nuclear Decommissioning Trust Liability to the ratepayers and are not included in net income, consistent with treatment per ASC 980, Regulated Operations. Nuclear decommissioning ARO liabilities were $282 million and $269 million as of December 31, 2018 and 2017, respectively. The following table represents the balance of ARO obligations as of December 31, 2018 and 2017, along with the additions, reductions and accretion related to the Company's ARO obligations for the year ended December 31, 2018:
| (In millions)
Balance as of December 31, 2017 | $ | 679 |
Revisions in estimates for current obligations | (27 | )
Additions | 9 |
Spending for current obligations | (27 | )
Accretion — Expense | 30 |
Accretion — Nuclear decommissioning | 15 |
Balance as of December 31, 2018 | $ | 679 |

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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