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Pension, OPEB and Savings Plans (Components Of Net Periodic Benefit Cost) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension Lift Out Settlement Charge | $ 6 | $ 332 | $ 334 |  |
Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service Cost |  |  | 90 | $ 142 | $ 151
Interest Cost |  |  | 259 | 167 | 140
Expected Return on Plan Assets |  |  | (361) | (484) | (476)
Amortization of Prior Service Cost |  |  | 0 | 0 | 0
Amortization of Net Actuarial Gain (Loss) |  |  | 83 | 60 | 103
Non-Operating Pension and Other Postretirement Plan (Credits) Costs |  |  | 319 | (257) | (233)
Pension Lift Out Settlement Charge |  |  | 338 | 0 | 0
Net Periodic Benefit Cost |  |  | 409 | (115) | (82)
Total Benefit Costs, Including Effect of Regulatory Asset |  |  | 409 | (115) | (82)
Other Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service Cost |  |  | 3 | 6 | 9
Interest Cost |  |  | 41 | 26 | 22
Expected Return on Plan Assets |  |  | (33) | (42) | (42)
Amortization of Prior Service Cost |  |  | (52) | (129) | (129)
Amortization of Net Actuarial Gain (Loss) |  |  | (2) | 15 | 44
Non-Operating Pension and Other Postretirement Plan (Credits) Costs |  |  | (46) | (130) | (105)
Pension Lift Out Settlement Charge |  |  | 0 | 0 | 0
Net Periodic Benefit Cost |  |  | (43) | (124) | (96)
Total Benefit Costs, Including Effect of Regulatory Asset |  |  | $ (43) | $ (124) | $ (96)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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