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Financial Risk Management Activities (Schedule Of Derivative Transactions Designated And Effective As Cash Flow Hedges) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | $ 0 | $ 0 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | (1) | (1) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (5) | (2) |
Cash Flow Hedges [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (1) | (1) | $ (3)
Interest Expense [Member] | Interest Rate Swap [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 0 | 0 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | $ (1) | $ (1) |

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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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