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Goodwill And Other Intangibles | 12 Months Ended
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Dec. 31, 2017
Goodwill [Line Items] |
Goodwill And Other Intangibles | Goodwill and Other Intangibles As of December 31, 2017 and 2016, Power had goodwill of $16 million related to the Bethlehem Energy Center facility. Power conducted an annual review for goodwill impairment in the fourth quarter of 2017 and concluded that goodwill continues to remain unimpaired. In addition to goodwill, as of December 31, 2017 and 2016, Power had intangible assets of $114 million and $98 million, respectively, related to emissions allowances and renewable energy credits. Emissions allowances and renewable energy credits are recorded at cost and evaluated for impairment at least annually. Emissions expense includes impairments of emissions allowances and costs for emissions, which is recorded as emissions occur. As load is served under contracts requiring energy from renewable sources, the related expense is recorded. The changes to Power’s intangible assets during 2016 and 2017 are presented in the following table:
|  |  | Emissions Allowances |  | Renewable Energy Credits |  | Total Other Intangibles |
|  |  | Millions |
| Balance as of January 1, 2016 |  | $ | 62 |  |  | $ | 40 |  |  | $ | 102 |  |
| Retirements |  | (6 | ) |  | (94 | ) |  | (100 | ) |
| Purchases |  | — |  |  | 99 |  |  | 99 |  |
| Sales and Transfers, net |  | (1 | ) |  | (1 | ) |  | (2 | ) |
| Impairments |  | (1 | ) |  | — |  |  | (1 | ) |
| Balance as of December 31, 2016 |  | $ | 54 |  |  | $ | 44 |  |  | $ | 98 |  |
| Retirements |  | (7 | ) |  | (93 | ) |  | (100 | ) |
| Purchases |  | 27 |  |  | 90 |  |  | 117 |  |
| Sales and Transfers, net |  | — |  |  | (1 | ) |  | (1 | ) |
| Balance as of December 31, 2017 |  | $ | 74 |  |  | $ | 40 |  |  | $ | 114 |  |
Power [Member] |
Goodwill [Line Items] |
Goodwill And Other Intangibles | Goodwill and Other Intangibles As of December 31, 2017 and 2016, Power had goodwill of $16 million related to the Bethlehem Energy Center facility. Power conducted an annual review for goodwill impairment in the fourth quarter of 2017 and concluded that goodwill continues to remain unimpaired. In addition to goodwill, as of December 31, 2017 and 2016, Power had intangible assets of $114 million and $98 million, respectively, related to emissions allowances and renewable energy credits. Emissions allowances and renewable energy credits are recorded at cost and evaluated for impairment at least annually. Emissions expense includes impairments of emissions allowances and costs for emissions, which is recorded as emissions occur. As load is served under contracts requiring energy from renewable sources, the related expense is recorded. The changes to Power’s intangible assets during 2016 and 2017 are presented in the following table:
|  |  | Emissions Allowances |  | Renewable Energy Credits |  | Total Other Intangibles |
|  |  | Millions |
| Balance as of January 1, 2016 |  | $ | 62 |  |  | $ | 40 |  |  | $ | 102 |  |
| Retirements |  | (6 | ) |  | (94 | ) |  | (100 | ) |
| Purchases |  | — |  |  | 99 |  |  | 99 |  |
| Sales and Transfers, net |  | (1 | ) |  | (1 | ) |  | (2 | ) |
| Impairments |  | (1 | ) |  | — |  |  | (1 | ) |
| Balance as of December 31, 2016 |  | $ | 54 |  |  | $ | 44 |  |  | $ | 98 |  |
| Retirements |  | (7 | ) |  | (93 | ) |  | (100 | ) |
| Purchases |  | 27 |  |  | 90 |  |  | 117 |  |
| Sales and Transfers, net |  | — |  |  | (1 | ) |  | (1 | ) |
| Balance as of December 31, 2017 |  | $ | 74 |  |  | $ | 40 |  |  | $ | 114 |  |

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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