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Available-For-Sale Securities (Narrative) (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2016 USD ($) Facility | Mar. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |
Other-Than-Temporary Impairments | $ 10 | $ 5
Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of Nuclear Facilities | Facility | 5 |
Other-Than-Temporary Impairments | $ 10 | $ 5
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other-Than-Temporary Impairments | 10 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
After tax amount of net unrealized gains recognized in AOCI | 101 |
Rabbi Trust [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
After tax amount of net unrealized gains recognized in AOCI | $ 6 |

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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=51664549&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=18733093&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=51664549&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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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