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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 |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | $ 1,764 | $ 1,794
Gross Unrealized Gains | 321 | 350
Gross Unrealized Losses | (34) | (11)
Fair Value | 2,051 | 2,133
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Domestic Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 463 | 497
Gross Unrealized Gains | 226 | 245
Gross Unrealized Losses | (7) | (2)
Fair Value | 682 | 740
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | International Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 318 | 311
Gross Unrealized Gains | 93 | 99
Gross Unrealized Losses | (7) | (3)
Fair Value | 404 | 407
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 781 | 808
Gross Unrealized Gains | 319 | 344
Gross Unrealized Losses | (14) | (5)
Fair Value | 1,086 | 1,147
Unrealized Gains (Losses) on Equity Securities still held | (10) |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 518 | 586
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (11) | (4)
Fair Value | 508 | 584
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Corporate [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 464 | 400
Gross Unrealized Gains | 1 | 4
Gross Unrealized Losses | (9) | (2)
Fair Value | 456 | 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 | (10) |
Cost | 982 | 986
Gross Unrealized Gains | 2 | 6
Gross Unrealized Losses | (20) | (6)
Fair Value | 964 | 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 | 226 | 227
Gross Unrealized Gains | 3 | 6
Gross Unrealized Losses | (4) | (2)
Fair Value | 225 | 231
Rabbi Trust [Member] | Domestic Equity Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 21 | 24
Gross Unrealized Gains | 2 | 3
Gross Unrealized Losses | 0 | 0
Fair Value | 23 | 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 | 2 | 3
Gross Unrealized Losses | 0 | 0
Fair Value | 23 | 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 | (3) |
Rabbi Trust [Member] | Government [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 91 | 85
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (2) | (1)
Fair Value | 89 | 85
Rabbi Trust [Member] | Corporate [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 114 | 118
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (2) | (1)
Fair Value | 113 | 119
Rabbi Trust [Member] | Total Debt Securities [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Cost | 205 | 203
Gross Unrealized Gains | 1 | 3
Gross Unrealized Losses | (4) | (2)
Fair Value | 202 | 204
Rabbi Trust [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Fair Value | $ 56 | $ 57

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