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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | $ 1,802 | $ 1,802 | $ 1,794
Gross Unrealized Gains | 347 | 347 | 350
Gross Unrealized Losses | (53) | (53) | (11)
Fair Value | 2,096 | 2,096 | 2,133
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 228 | 228 | 227
Gross Unrealized Gains | 4 | 4 | 6
Gross Unrealized Losses | (7) | (7) | (2)
Fair Value | 225 | 225 | 231
Rabbi Trust [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value | 57 | 57 | 57
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 467 | 467 | 497
Gross Unrealized Gains | 268 | 268 | 245
Gross Unrealized Losses | (7) | (7) | (2)
Fair Value | 728 | 728 | 740
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 21 | 21 | 24
Gross Unrealized Gains | 4 | 4 | 3
Gross Unrealized Losses | 0 | 0 | 0
Fair Value | 25 | 25 | 27
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 330 | 330 | 311
Gross Unrealized Gains | 78 | 78 | 99
Gross Unrealized Losses | (16) | (16) | (3)
Fair Value | 392 | 392 | 407
International Equity Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 0 | 0 | 0
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | 0 | 0 | 0
Fair Value | 0 | 0 | 0
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 797 | 797 | 808
Gross Unrealized Gains | 346 | 346 | 344
Gross Unrealized Losses | (23) | (23) | (5)
Fair Value | 1,120 | 1,120 | 1,147
Unrealized Gains (Losses) on Equity Securities still held | 41 | 26 |
Equity Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 21 | 21 | 24
Gross Unrealized Gains | 4 | 4 | 3
Gross Unrealized Losses | 0 | 0 | 0
Fair Value | 25 | 25 | 27
Unrealized Gains (Losses) on Equity Securities still held | 1 | 2 |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
After tax amount of net unrealized gains recognized in AOCI |  | (5) |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 537 | 537 | 586
Gross Unrealized Gains | 0 | 0 | 2
Gross Unrealized Losses | (17) | (17) | (4)
Fair Value | 520 | 520 | 584
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 103 | 103 | 85
Gross Unrealized Gains | 0 | 0 | 1
Gross Unrealized Losses | (4) | (4) | (1)
Fair Value | 99 | 99 | 85
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 468 | 468 | 400
Gross Unrealized Gains | 1 | 1 | 4
Gross Unrealized Losses | (13) | (13) | (2)
Fair Value | 456 | 456 | 402
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 104 | 104 | 118
Gross Unrealized Gains | 0 | 0 | 2
Gross Unrealized Losses | (3) | (3) | (1)
Fair Value | 101 | 101 | 119
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 1,005 | 1,005 | 986
Gross Unrealized Gains | 1 | 1 | 6
Gross Unrealized Losses | (30) | (30) | (6)
Fair Value | 976 | 976 | 986
After tax amount of net unrealized gains recognized in AOCI |  | (17) |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 207 | 207 | 203
Gross Unrealized Gains | 0 | 0 | 3
Gross Unrealized Losses | (7) | (7) | (2)
Fair Value | 200 | 200 | $ 204
Other Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 0 | 0 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | $ 0 | $ 0 |

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