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Goodwill and Other Intangible Assets (Intangible Assets Acquired) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 179 | $ 112
Computer Software, Intangible Asset [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 67 | $ 17
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years | 7 years
Other Intangible Assets [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 8
Other intangible assets acquired | $ 11 |
Contracts |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 50 | $ 34
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 24 years | 25 years
Project Development Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 35 | $ 53
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 23 years | 30 years
Emission allowances [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 16 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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