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Goodwill And Other Intangibles (Schedule of Intangibles) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Purchases of Intangible Assets | $ 117 | $ 99 | $ 106
Intangible Assets | 114 | 98 |
Power [Member] |  |  |
Goodwill [Line Items] |  |  |
Retirement of Intangibles | (100) | (100) |
Purchases of Intangible Assets | 117 | 99 | 106
Sales and Transfers of Intangible Assets | (1) | (2) |
Impairment of Intangible Assets |  | (1) |
Intangible Assets | 114 | 98 | 102
Renewable Energy Credits [Member] | Power [Member] |  |  |
Goodwill [Line Items] |  |  |
Retirement of Intangibles | (93) | (94) |
Purchases of Intangible Assets | 90 | 99 |
Sales and Transfers of Intangible Assets | (1) | (1) |
Impairment of Intangible Assets |  | 0 |
Intangible Assets | 40 | 44 | 40
Emissions Allowances [Member] | Power [Member] |  |  |
Goodwill [Line Items] |  |  |
Retirement of Intangibles | (7) | (6) |
Purchases of Intangible Assets | 27 | 0 |
Sales and Transfers of Intangible Assets | 0 | (1) |
Impairment of Intangible Assets |  | (1) |
Intangible Assets | $ 74 | $ 54 | $ 62

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- Definition Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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