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Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in AOCI, After-Tax | $ 143 | $ (11) | $ (38)
Less: Loss Reclassified to Income, After-Tax | 11 | (4) | 7
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Balance as of Beginning of Year | (13) | (21) |
Gain (Loss) Recognized in AOCI, Pre-Tax | 0 | (6) |
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax | 4 | 14 | 4
Balance as of End of Year | (9) | (13) | (21)
Balance as of Beginning of Year | (9) | (15) |
Gain (Loss) Recognized in AOCI, After-Tax | 0 | (4) | (17)
Less: Loss Reclassified to Income, After-Tax | 3 | 10 | 3
Balance as of End of Year | $ (6) | $ (9) | $ (15)

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