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Pension And OPEB (Components Of Net Periodic Benefit Cost) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Non-Operating Pension and OPEB (Credits) Costs | $ (19) | $ (1) | $ (38) | $ (1)
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 33 | 28 | 65 | 57
Interest Cost | 52 | 51 | 104 | 102
Expected Return on Plan Assets | (110) | (99) | (220) | (197)
Amortization of Prior Service Cost | (5) | (4) | (9) | (9)
Amortization of Actuarial Loss | 21 | 25 | 42 | 49
Non-Operating Pension and OPEB (Credits) Costs | (42) | (27) | (83) | (55)
Total Benefit Costs | (9) | 1 | (18) | 2
OPEB [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 5 | 4 | 9 | 8
Interest Cost | 17 | 16 | 33 | 32
Expected Return on Plan Assets | (11) | (9) | (21) | (17)
Amortization of Prior Service Cost | 0 | (2) | 0 | (5)
Amortization of Actuarial Loss | 16 | 12 | 32 | 25
Non-Operating Pension and OPEB (Credits) Costs | 22 | 17 | 44 | 35
Total Benefit Costs | $ 27 | $ 21 | $ 53 | $ 43

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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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