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Available-For-Sale Securities (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities OTTI Charge | $ 12 | $ 28 | $ 53
Power [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities OTTI Charge | 12 | $ 28 | $ 53
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities OTTI Charge | 12 |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 175 |  |
Decommissioning Liability, Noncurrent | 756 |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Minimum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Decommissioning Costs Including Contingencies | 2,800 |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Maximum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Decommissioning Costs Including Contingencies | 3,000 |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | $ 2 |  |

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- Definition Decommissioning costs including contingencies. + References No definition available. + Details
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- Definition Amount of a decommissioning liability associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service. This may include operating assets such as nuclear power plants or shipping vessels. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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