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Pension And OPEB (Components Of Net Periodic Benefit Cost) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Non-Operating Pension and OPEB Credits (Costs) | $ 19 | $ 0
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service Cost | 32 | 29
Interest Cost | 52 | 51
Expected Return on Plan Assets | (110) | (98)
Amortization of Prior Service Cost | (4) | (5)
Amortization of Actuarial Loss | 21 | 24
Non-Operating Pension and OPEB Credits (Costs) | (41) | (28)
Total Benefit Costs | (9) | 1
OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service Cost | 4 | 4
Interest Cost | 16 | 16
Expected Return on Plan Assets | (10) | (8)
Amortization of Prior Service Cost | 0 | (3)
Amortization of Actuarial Loss | 16 | 13
Non-Operating Pension and OPEB Credits (Costs) | 22 | 18
Total Benefit Costs | $ 26 | $ 22

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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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