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Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (Loss) in AOCI | $ 10 | $ 13 |
(Gain) Loss into Income | (2) | 4 |
Cash Flow Hedges [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Pre-Tax Balance at Beginning of Period | (21) | (2) | $ (2)
Gain (Loss) in AOCI | (6) |  | (23)
(Gain) Loss into Income | 2 |  | 4
Pre-Tax Balance at End of Period | (25) |  | (21)
After-Tax Balance at Beginning of Period | (15) | (1) | (1)
Gain (Loss) in AOCI | (4) | (4) | (17)
(Gain) Loss into Income | 1 | $ 0 | 3
After-Tax Balance at End of Period | $ (18) |  | $ (15)

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- Definition Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Pre Tax + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
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