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Goodwill And Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Power [Member] |
Goodwill [Line Items] |
Schedule of Intangibles | 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 Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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