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Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | $ 13 | $ 0 | $ 0
Amount of Pre-Tax Loss Reclassified from AOCL into Income, Effective Portion | 5 | (5) | (4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 225 | 30 | 11
Interest Rate Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 13 | 0 | 0
Amount of Pre-Tax Loss Reclassified from AOCL into Income, Effective Portion | 5 | (5) | (4)
Cash Flow Hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | 3 | 3
Cash Flow Hedges | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | $ (3) | $ 3 | $ 3

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480627/815-20-45-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A + Details
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