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Goodwill (Rollforward of Goodwill) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill balance | $ 19,425 | $ 19,425
Accumulated impairment charges | (122) | (29)
Goodwill balance, adjusted for accumulated impairment charges | 19,303 | 19,396
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) | (29)
Goodwill balance, adjusted for accumulated impairment charges |  | $ 93

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