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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | $ 1,785 | $ 1,794
Gross Unrealized Gains | 312 | 350
Gross Unrealized Losses | (48) | (11)
Fair Value | 2,049 | 2,133
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Domestic Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 471 | 497
Gross Unrealized Gains | 235 | 245
Gross Unrealized Losses | (8) | (2)
Fair Value | 698 | 740
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | International Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 321 | 311
Gross Unrealized Gains | 76 | 99
Gross Unrealized Losses | (14) | (3)
Fair Value | 383 | 407
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 792 | 808
Gross Unrealized Gains | 311 | 344
Gross Unrealized Losses | (22) | (5)
Fair Value | 1,081 | 1,147
Unrealized Gains (Losses) on Equity Securities still held | (3) |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 528 | 586
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (12) | (4)
Fair Value | 517 | 584
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Corporate [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 464 | 400
Gross Unrealized Gains | 0 | 4
Gross Unrealized Losses | (14) | (2)
Fair Value | 450 | 402
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
After tax amount of net unrealized gains recognized in AOCI | (14) |
Cost | 992 | 986
Gross Unrealized Gains | 1 | 6
Gross Unrealized Losses | (26) | (6)
Fair Value | 967 | 986
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 1 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 1 |
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 227 | 227
Gross Unrealized Gains | 3 | 6
Gross Unrealized Losses | (6) | (2)
Fair Value | 224 | 231
Rabbi Trust [Member] | Domestic Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 21 | 24
Gross Unrealized Gains | 3 | 3
Gross Unrealized Losses | 0 | 0
Fair Value | 24 | 27
Rabbi Trust [Member] | International Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 0 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 0 | 0
Rabbi Trust [Member] | Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 21 | 24
Gross Unrealized Gains | 3 | 3
Gross Unrealized Losses | 0 | 0
Fair Value | 24 | 27
Unrealized Gains (Losses) on Equity Securities still held | 1 |
Rabbi Trust [Member] | Debt Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
After tax amount of net unrealized gains recognized in AOCI | (4) |
Rabbi Trust [Member] | Government [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 96 | 85
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (2) | (1)
Fair Value | 94 | 85
Rabbi Trust [Member] | Corporate [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 110 | 118
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (4) | (1)
Fair Value | 106 | 119
Rabbi Trust [Member] | Total Debt Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 206 | 203
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (6) | (2)
Fair Value | 200 | 204
Rabbi Trust [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Fair Value | $ 56 | $ 57

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