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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, 2016 | Dec. 31, 2015
--- | --- | ---
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 1,594 | $ 1,584
Gross Unrealized Gains | 272 | 196
Gross Unrealized Losses | (9) | (26)
Fair Value | 1,857 | 1,754
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 691 | 693
Gross Unrealized Gains | 238 | 185
Gross Unrealized Losses | (7) | (13)
Fair Value | 922 | 865
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 509 | 483
Gross Unrealized Gains | 21 | 8
Gross Unrealized Losses | 0 | (3)
Fair Value | 530 | 488
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 349 | 366
Gross Unrealized Gains | 13 | 3
Gross Unrealized Losses | (2) | (10)
Fair Value | 360 | 359
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 858 | 849
Gross Unrealized Gains | 34 | 11
Gross Unrealized Losses | (2) | (13)
Fair Value | 890 | 847
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 45 | 42
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 45 | 42
Rabbi Trust [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 207 | 204
Gross Unrealized Gains | 17 | 11
Gross Unrealized Losses | 0 | (2)
Fair Value | 224 | 213
Rabbi Trust [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 11 | 12
Gross Unrealized Gains | 11 | 10
Gross Unrealized Losses | 0 | 0
Fair Value | 22 | 22
Rabbi Trust [Member] | Government Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 104 | 108
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 0 | (1)
Fair Value | 107 | 108
Rabbi Trust [Member] | Other Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 91 | 82
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | 0 | (1)
Fair Value | 94 | 81
Rabbi Trust [Member] | Total Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 195 | 190
Gross Unrealized Gains | 6 | 1
Gross Unrealized Losses | 0 | (2)
Fair Value | 201 | 189
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 | $ 55 | $ 52

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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=51813488&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=49167202&loc=d3e26610-111562 + Details
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