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Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Asset Impairment Charges | $ 402 | $ 282 | $ 18
Commercial Renewables [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset Impairment Charges |  |  | 71
Property, Plant and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset Impairment Charges | 58 |  |
Finite-Lived Intangible Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset Impairment Charges | 11 |  |
Assets Leased to Others [Member] | Commercial Renewables [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Contingent lease payments | 268 | $ 262 | $ 216
Renewable energy projects | 3,358 |  |
Accumulated depreciation and amortization | (602) |  |
Wind Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset Impairment Charges | $ 69 |  |

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