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Property, Plant and Equipment (Regulated and Non-Regulated Generation and Distribution PP&E) (Details) - USD ($) $ in Millions | 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)
Net electric generation and distribution assets and other | 16,177 | 16,992
Regulated Operation [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | 8,093 | 7,815
Accumulated depreciation | (3,357) | (3,299)
Net electric generation and distribution assets and other | 4,736 | 4,516
Unregulated Operation [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | 16,026 | 17,096
Accumulated depreciation | (4,585) | (4,620)
Net electric generation and distribution assets and other | $ 11,441 | $ 12,476

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- Definition This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy, net of accumulated depreciation, included in noncurrent assets of discontinued and held for sale businesses. + 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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