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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - Power [Member] $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($) Counterparty
Derivative [Line Items] |  |
Current Exposure | $ 118 |
Securities held as Collateral | 14 |
Net exposure | 104 |
Number of Counterparties greater than 10% | $ 2 |
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty | 137 |
Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Percentage Of Credit Exposure | 97.00% |
Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | $ 112 |
Securities held as Collateral | 12 |
Net exposure | 100 |
Number of Counterparties greater than 10% | 2 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 50 | [1]
External Credit Rating, Non Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 6 |
Securities held as Collateral | 2 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
Non-Investment Grade [Member] |  |
Derivative [Line Items] |  |
Net exposure | 4 |
Number of Counterparties greater than 10% | 0 |
Cash [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | 2 |
Letter of Credit [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | $ 12 |
[1] | Represents net exposure of $39 million

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