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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)