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Available-For-Sale Securities (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 1,549 | $ 1,554
Gross Unrealized Gains | 192 | 238
Gross Unrealized Losses | (26) | (12)
Fair Value | 1,715 | 1,780
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 667 | 685
Gross Unrealized Gains | 176 | 220
Gross Unrealized Losses | (18) | (8)
Fair Value | 825 | 897
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 445 | 430
Gross Unrealized Gains | 10 | 9
Gross Unrealized Losses | (1) | (1)
Fair Value | 454 | 438
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 402 | 333
Gross Unrealized Gains | 6 | 9
Gross Unrealized Losses | (7) | (3)
Fair Value | 401 | 339
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 847 | 763
Gross Unrealized Gains | 16 | 18
Gross Unrealized Losses | (8) | (4)
Fair Value | 855 | 777
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 35 | 106
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 35 | 106
Rabbi Trust [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 204 | 177
Gross Unrealized Gains | 10 | 14
Gross Unrealized Losses | (3) | 0
Fair Value | 211 | 191
Rabbi Trust [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 11 | 12
Gross Unrealized Gains | 9 | 11
Gross Unrealized Losses | 0 | 0
Fair Value | 20 | 23
Rabbi Trust [Member] | Government Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 106 | 89
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (1) | 0
Fair Value | 106 | 91
Rabbi Trust [Member] | Other Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 86 | 74
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (2) | 0
Fair Value | 84 | 75
Rabbi Trust [Member] | Total Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 192 | 163
Gross Unrealized Gains | 1 | 3
Gross Unrealized Losses | (3) | 0
Fair Value | 190 | 166
Rabbi Trust [Member] | Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1 | 2
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1 | 2
Rabbi Trust [Member] | Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 52 | $ 45

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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