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Goodwill And Other Intangibles | 12 Months Ended
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Dec. 31, 2018
Goodwill [Line Items] |
Goodwill And Other Intangibles | Goodwill and Other Intangibles As of December 31, 2018 and 2017, 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 2018 and concluded that goodwill continues to remain unimpaired. In addition to goodwill, as of December 31, 2018 and 2017, Power had intangible assets of $143 million and $114 million, respectively, related to emissions allowances and RECs. Emissions allowances and RECs are recorded at cost and evaluated for impairment at least annually. Emissions expense includes impairments of emissions allowances, if any, 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 2017 and 2018 are presented in the following table:
|  |  | Emissions Allowances |  | RECs |  | Total Other Intangibles |
|  |  | Millions |
| Balance as of January 1, 2017 |  | $ | 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 |  |
| Retirements |  | (26 | ) |  | (90 | ) |  | (116 | ) |
| Purchases |  | 36 |  |  | 110 |  |  | 146 |  |
| Sales and Transfers, net |  | — |  |  | (1 | ) |  | (1 | ) |
| Balance as of December 31, 2018 |  | $ | 84 |  |  | $ | 59 |  |  | $ | 143 |  |
Power [Member] |
Goodwill [Line Items] |
Goodwill And Other Intangibles | Goodwill and Other Intangibles As of December 31, 2018 and 2017, 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 2018 and concluded that goodwill continues to remain unimpaired. In addition to goodwill, as of December 31, 2018 and 2017, Power had intangible assets of $143 million and $114 million, respectively, related to emissions allowances and RECs. Emissions allowances and RECs are recorded at cost and evaluated for impairment at least annually. Emissions expense includes impairments of emissions allowances, if any, 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 2017 and 2018 are presented in the following table:
|  |  | Emissions Allowances |  | RECs |  | Total Other Intangibles |
|  |  | Millions |
| Balance as of January 1, 2017 |  | $ | 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 |  |
| Retirements |  | (26 | ) |  | (90 | ) |  | (116 | ) |
| Purchases |  | 36 |  |  | 110 |  |  | 146 |  |
| Sales and Transfers, net |  | — |  |  | (1 | ) |  | (1 | ) |
| Balance as of December 31, 2018 |  | $ | 84 |  |  | $ | 59 |  |  | $ | 143 |  |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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