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Financial Risk Management Activities (Schedule Of Derivative Instruments Not Designated As Hedging Instruments And Impact On Results Of Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | $ 2 | $ 17 | $ 30 | $ 14
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 4 | 1 | 7 |
Energy-Related Contracts [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 224 | 338 | 77 | 1,241
Energy-Related Contracts [Member] | Operating Revenues [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 225 | 339 | 77 | 1,241
Energy-Related Contracts [Member] | Energy Costs [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (1) | (1) | 0 | 0
Interest Rate Swap [Member] |  |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 2 | 17 | 30 | $ 14
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | $ 4 | $ 1 | $ 7 |

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- Definition The effective portion of gain 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 -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC + Details
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- Definition Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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