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Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | $ 0 | $ (6) | $ (23)
Amount of Pre-Tax Loss Reclassified from AOCL into Income, Effective Portion | (4) | (14) | (4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 11 | (4) | 7
Interest Expense [Member] | Interest Rate Swaps [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 0 | (6) | (23)
Amount of Pre-Tax Loss Reclassified from AOCL into Income, Effective Portion | (4) | (14) | (4)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | $ 3 | $ 10 | $ 3

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