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Pension And OPEB (Components Of Net Periodic Benefit Cost) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Non-Operating Pension and OPEB (Credits) Costs | $ (19) | $ 0 | $ (57) | $ (1)
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 32 | 29 | 97 | 86
Interest Cost | 52 | 51 | 156 | 153
Expected Return on Plan Assets | (111) | (98) | (331) | (295)
Amortization of Prior Service Cost | (4) | (5) | (13) | (14)
Amortization of Actuarial Loss | 22 | 24 | 64 | 73
Non-Operating Pension and OPEB (Credits) Costs | (41) | (28) | (124) | (83)
Total Benefit Costs | (9) | 1 | (27) | 3
OPEB [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 4 | 4 | 13 | 12
Interest Cost | 16 | 15 | 49 | 47
Expected Return on Plan Assets | (9) | (8) | (30) | (25)
Amortization of Prior Service Cost | (1) | (3) | (1) | (8)
Amortization of Actuarial Loss | 16 | 13 | 48 | 38
Non-Operating Pension and OPEB (Credits) Costs | 22 | 17 | 66 | 52
Total Benefit Costs | $ 26 | $ 21 | $ 79 | $ 64

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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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