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Property, Plant and Equipment (Components of PP&E) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 24,119 | $ 24,911
Accumulated depreciation | (7,942) | (7,919)
Property, Plant and Equipment, Net | 16,177 | 16,992
Property Plant And Equipment Net Of Accumulated Depreciation Mortgaged Pledged Or Subject To Liens | 10,000 | 10,000
Electric generation and distribution facilities |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 21,529 | 22,337
Electric generation and distribution facilities | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 8 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 | $ 1,971 | 1,906
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 | 71 years |
Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 284 | 303
Furniture and Fixtures [Member] | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 2 years |
Furniture and Fixtures [Member] | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Life | 32 years |
Other |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 335 | $ 365
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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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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