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Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Gain (Loss) in AOCI | $ 16 | $ 30 | $ (24) | $ 40 |
(Gain) Loss into Income | (4) | 4 | (6) | 6 |
Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Pre-Tax Balance at Beginning of Period |  |  | (13) | (21) | $ (21)
Gain (Loss) in AOCI |  |  | 0 |  | (6)
(Gain) Loss into Income | 1 | 4 | 2 | 6 | 14
Pre-Tax Balance at End of Period | (11) |  | (11) |  | (13)
After-Tax Balance at Beginning of Period |  |  | (9) | (15) | (15)
Gain (Loss) in AOCI | 0 | 0 | 0 | (4) | (4)
(Gain) Loss into Income | 0 | $ (3) | (1) | $ (4) | (10)
After-Tax Balance at End of Period | $ (8) |  | $ (8) |  | $ (9)

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- Definition Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect After Tax + References No definition available. + Details
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