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Trust Investments (Narrative) (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($) Facility
Power [Member] |
Schedule of Trust Investments [Line Items] |
Number of Nuclear Facilities | Facility | 5
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |
Schedule of Trust Investments [Line Items] |
After tax amount of net unrealized gains recognized in AOCI | $ (10)
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |
Schedule of Trust Investments [Line Items] |
Unrealized Gains (Losses) on Equity Securities still held | (10)
Equity Securities [Member] | Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Unrealized Gains (Losses) on Equity Securities still held | $ (1)

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