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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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 | $ 0 | $ (6)
Amount of Pre-Tax Loss Reclassified from AOCL into Income, Effective Portion | (5) | (4) | (14)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 30 | 11 | (4)
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 | 0 | (6)
Amount of Pre-Tax Loss Reclassified from AOCL into Income, Effective Portion | (5) | (4) | (14)
Cash Flow Hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 3 | 3 | 10
Cash Flow Hedges | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | $ 3 | $ 3 | $ 10

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=121577181&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 + Details
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