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Pension, OPEB and Savings Plans (Components Of Net Periodic Benefit Cost) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | $ 114 | $ 109 | $ 123
Interest Cost | 204 | 202 | 234
Expected Return on Plan Assets | (394) | (394) | (414)
Amortization of Prior Service Cost | (18) | (19) | (19)
Amortization of Actuarial Loss | 97 | 158 | 150
Net Periodic Benefit Cost | 3 | 56 | 74
Total Benefit Costs, Including Effect of Regulatory Asset | 3 | 56 | 74
Other Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 17 | 17 | 22
Interest Cost | 63 | 59 | 67
Expected Return on Plan Assets | (34) | (31) | (31)
Amortization of Prior Service Cost | (11) | (14) | (14)
Amortization of Actuarial Loss | 51 | 40 | 43
Net Periodic Benefit Cost | 86 | 71 | 87
Total Benefit Costs, Including Effect of Regulatory Asset | $ 86 | $ 71 | $ 87

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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