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Available-For-Sale Securities (Fair Values And Gross Unrealized Gains And Losses For The Securities) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Rabbi Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | $ 209 |  | $ 204
Gross Unrealized Gains | 12 |  | 11
Gross Unrealized Losses | (4) |  | (2)
Fair Value | 217 |  | 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 | 105 |  | 108
Gross Unrealized Gains | 0 |  | 1
Gross Unrealized Losses | (2) |  | (1)
Fair Value | 103 |  | 108
Rabbi Trust [Member] | Other Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 92 |  | 82
Gross Unrealized Gains | 1 |  | 0
Gross Unrealized Losses | (2) |  | (1)
Fair Value | 91 |  | 81
Rabbi Trust [Member] | Total Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 197 |  | 190
Gross Unrealized Gains | 1 |  | 1
Gross Unrealized Losses | (4) |  | (2)
Fair Value | 194 |  | 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
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 1,604 |  | 1,584
Gross Unrealized Gains | 275 |  | 196
Gross Unrealized Losses | (21) |  | (26)
Fair Value | 1,858 | [1] | 1,754
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 705 |  | 693
Gross Unrealized Gains | 263 |  | 185
Gross Unrealized Losses | (11) |  | (13)
Fair Value | 957 |  | 865
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 518 |  | 483
Gross Unrealized Gains | 8 |  | 8
Gross Unrealized Losses | (6) |  | (3)
Fair Value | 520 |  | 488
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Other Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 337 |  | 366
Gross Unrealized Gains | 4 |  | 3
Gross Unrealized Losses | (4) |  | (10)
Fair Value | 337 |  | 359
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Total Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 855 |  | 849
Gross Unrealized Gains | 12 |  | 11
Gross Unrealized Losses | (10) |  | (13)
Fair Value | 857 |  | 847
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Other Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 44 |  | 42
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | 0 |  | 0
Fair Value | 44 |  | 42
Power [Member] | Rabbi Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | $ 53 |  | $ 52
[1] | (A)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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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