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Property, Plant and Equipment (Components of PP&E) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 25,242 | $ 24,119
Accumulated depreciation | (8,227) | (7,942)
Property, Plant and Equipment, Net | 17,015 | 16,177
Property Plant And Equipment Net Of Accumulated Depreciation Mortgaged Pledged Or Subject To Liens | 11,000 | 10,000
Electric generation and distribution facilities |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 22,875 | 21,529
Electric generation and distribution facilities | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 7 years |
Electric generation and distribution facilities | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 40 years |
Other buildings |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 1,651 | 1,971
Other buildings | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 5 years |
Other buildings | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 72 years |
Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 310 | 284
Furniture and Fixtures [Member] | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 3 years |
Furniture and Fixtures [Member] | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 25 years |
Other |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 406 | $ 335
Other | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 5 years |
Other | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 44 years |

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- Definition Amount of property, plant and equipment net of accumulated depreciation mortgaged, pledged, or subject to liens + References No definition available. + Details
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