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Trust Investments (Narrative) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |
Schedule of Trust Investments [Line Items] |
Decommissioning Liability, Noncurrent | $ 708
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Minimum [Member] |
Schedule of Trust Investments [Line Items] |
Decommissioning Costs Including Contingencies | 2,800
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Maximum [Member] |
Schedule of Trust Investments [Line Items] |
Decommissioning Costs Including Contingencies | 3,000
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |
Schedule of Trust Investments [Line Items] |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | (12)
Debt Securities [Member] | Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | $ (4)

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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associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service.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://fasb.org/us-gaap/role/ref/legacyRef -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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