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Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Schedule of Trust Investments [Line Items] |  |  |
Net Gains (Losses) on Trust Investments |  | $ 128 | $ (22)
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Proceeds from Sales | [1] | 44 | 25
Gross Realized Gains |  | 1 | 2
Gross Realized Losses |  | (1) | (2)
Net Realized Gains (Losses) | [2] | 0 | 0
Unrealized Gain (Loss) on Securities |  | 3 | 0
Net Gains (Losses) on Trust Investments |  | 3 | 0
Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Net Gains (Losses) on Trust Investments |  | 126 | (22)
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Proceeds from Sales | [3] | 453 | 372
Gross Realized Gains |  | 45 | 24
Gross Realized Losses |  | (19) | (12)
Net Realized Gains (Losses) | [4] | 26 | 12
Unrealized Gain (Loss) on Securities |  | 99 | (34)
Net Gains (Losses) on Trust Investments |  | $ 125 | $ (22)
[1] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[2] | The cost of these securities was determined on the basis of specific identification.
[3] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[4] | The cost of these securities was determined on the basis of specific identification.

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