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Intangibles (Schedule of Intangibles) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |
Retirement of Intangibles | $ (172) | $ (102) |
Purchases of Intangible Assets | 98 | 111 | $ 98
Sales and Transfers of Intangible Assets | (63) |  |
Impairments | (1) |  |
Intangible Assets | 20 | 158 | 149
Renewable Energy Credits [Member] |  |  |
Goodwill [Line Items] |  |  |
Retirement of Intangibles | (114) | (93) |
Purchases of Intangible Assets | 89 | 94 |
Sales and Transfers of Intangible Assets | (1) |  |
Impairments | 0 |  |
Intangible Assets | 20 | 46 | 45
Emissions Allowances [Member] |  |  |
Goodwill [Line Items] |  |  |
Retirement of Intangibles | (58) | (9) |
Purchases of Intangible Assets | 9 | 17 |
Sales and Transfers of Intangible Assets | (62) |  |
Impairments | (1) |  |
Intangible Assets | 0 | $ 112 | $ 104
Transfer to Assets Held for Sale | $ 52 |  |

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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 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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