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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Trust Investments, Cost | $ 1,815 | $ 1,769
Gross Unrealized Gains | 263 | 192
Gross Unrealized Losses | (29) | (83)
Trust Investments, Fair Value | 2,049 | 1,878
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Trust Investments, Cost | 227 | 228
Gross Unrealized Gains | 7 | 2
Gross Unrealized Losses | (1) | (6)
Trust Investments, Fair Value | 233 | 224
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,004 | 999
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 12 | 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 7 | 24
Debt Securities, Available-for-Sale, Fair Value | 1,009 | 978
Total Debt Securities [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 205 | 206
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1 | 6
Debt Securities, Available-for-Sale, Fair Value | 208 | 201
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Equity Securities, Cost | 811 | 770
Equity Securities, Accumulated Gross Unrealized Gain | 251 | 189
Equity Securities, Accumulated Gross Unrealized Loss | 22 | 59
Equity Securities, Fair Value | 1,040 | 900
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 495 | 501
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 4 | 15
Debt Securities, Available-for-Sale, Fair Value | 497 | 487
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 97 | 96
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1 | 4
Debt Securities, Available-for-Sale, Fair Value | 98 | 92
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 509 | 498
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3 | 9
Debt Securities, Available-for-Sale, Fair Value | 512 | 491
Government Debt Securities [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 108 | 110
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 2
Debt Securities, Available-for-Sale, Fair Value | 110 | 109
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Equity Securities, Cost | 388 | 323
Equity Securities, Accumulated Gross Unrealized Gain | 68 | 36
Equity Securities, Accumulated Gross Unrealized Loss | 16 | 30
Equity Securities, Fair Value | 440 | 329
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Equity Securities, Cost | 423 | 447
Equity Securities, Accumulated Gross Unrealized Gain | 183 | 153
Equity Securities, Accumulated Gross Unrealized Loss | 6 | 29
Equity Securities, Fair Value | 600 | 571
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Equity Securities, Cost | 22 | 22
Equity Securities, Accumulated Gross Unrealized Gain | 3 | 1
Equity Securities, Accumulated Gross Unrealized Loss | 0 | 0
Equity Securities, Fair Value | $ 25 | $ 23

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