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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, 2017 | Dec. 31, 2016
--- | --- | ---
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | $ 1,674 | $ 1,604
Gross Unrealized Gains |  | 348 | 275
Gross Unrealized Losses |  | (10) | (21)
Fair Value | [1] | 2,012 | 1,858
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 706 | 705
Gross Unrealized Gains |  | 331 | 263
Gross Unrealized Losses |  | (5) | (11)
Fair Value |  | 1,032 | 957
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 561 | 518
Gross Unrealized Gains |  | 10 | 8
Gross Unrealized Losses |  | (4) | (6)
Fair Value |  | 567 | 520
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Corporate [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 352 | 337
Gross Unrealized Gains |  | 7 | 4
Gross Unrealized Losses |  | (1) | (4)
Fair Value |  | 358 | 337
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 913 | 855
Gross Unrealized Gains |  | 17 | 12
Gross Unrealized Losses |  | (5) | (10)
Fair Value |  | 925 | 857
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 55 | 44
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 55 | 44
Rabbi Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 224 | 209
Gross Unrealized Gains |  | 6 | 12
Gross Unrealized Losses |  | (1) | (4)
Fair Value |  | 229 | 217
Rabbi Trust [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 22 | 11
Gross Unrealized Gains |  | 1 | 11
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 23 | 22
Rabbi Trust [Member] | Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 82 | 105
Gross Unrealized Gains |  | 2 | 0
Gross Unrealized Losses |  | 0 | (2)
Fair Value |  | 84 | 103
Rabbi Trust [Member] | Corporate [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 118 | 92
Gross Unrealized Gains |  | 3 | 1
Gross Unrealized Losses |  | (1) | (2)
Fair Value |  | 120 | 91
Rabbi Trust [Member] | Total Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 200 | 197
Gross Unrealized Gains |  | 5 | 1
Gross Unrealized Losses |  | (1) | (4)
Fair Value |  | 204 | 194
Rabbi Trust [Member] | Other Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost |  | 2 | 1
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 2 | 1
Rabbi Trust [Member] | Power [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value |  | $ 57 | $ 53
[1] | The NDT available-for-sale securities table excludes cash of $1 million which is part of the NDT Fund.

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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