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Goodwill And Other Intangibles (Schedule of Intangibles) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Purchases of Intangible Assets | $ 146 | $ 117 | $ 99
Intangible Assets | 143 | 114 |
Power [Member] |  |  |
Goodwill [Line Items] |  |  |
Retirement of Intangibles | (116) | (100) |
Purchases of Intangible Assets | 146 | 117 | 99
Sales and Transfers of Intangible Assets | (1) | (1) |
Intangible Assets | 143 | 114 | 98
Renewable Energy Credits [Member] | Power [Member] |  |  |
Goodwill [Line Items] |  |  |
Retirement of Intangibles | (90) | (93) |
Purchases of Intangible Assets | 110 | 90 |
Sales and Transfers of Intangible Assets | (1) | (1) |
Intangible Assets | 59 | 40 | 44
Emissions Allowances [Member] | Power [Member] |  |  |
Goodwill [Line Items] |  |  |
Retirement of Intangibles | (26) | (7) |
Purchases of Intangible Assets | 36 | 27 |
Sales and Transfers of Intangible Assets | 0 | 0 |
Intangible Assets | $ 84 | $ 74 | $ 54

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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 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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- 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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