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Goodwill (Rollforward of Goodwill) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill balance | $ 19,425 | $ 19,425
Accumulated impairment charges | (122) | (122)
Goodwill balance, adjusted for accumulated impairment charges | 19,303 | 19,303
Electric Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 17,379 | 17,379
Goodwill balance, adjusted for accumulated impairment charges | 17,379 | 17,379
Gas Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 1,924 | 1,924
Goodwill balance, adjusted for accumulated impairment charges | 1,924 | 1,924
Commercial Renewables [Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 122 | 122
Accumulated impairment charges | $ (122) | $ (122)

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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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