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Pension And OPEB (Components Of Net Periodic Benefit Cost) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Non-Operating Pension and OPEB (Credits) Costs | $ (33) | $ (19)
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service Cost | 29 | 32
Interest Cost | 58 | 52
Expected Return on Plan Assets | (97) | (110)
Amortization of Prior Service Cost | (5) | (4)
Amortization of Actuarial Loss | 27 | 21
Non-Operating Pension and OPEB (Credits) Costs | (17) | (41)
Total Benefit Costs | 12 | (9)
OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service Cost | 2 | 4
Interest Cost | 11 | 16
Expected Return on Plan Assets | (9) | (10)
Amortization of Prior Service Cost | (32) | 0
Amortization of Actuarial Loss | 13 | 16
Non-Operating Pension and OPEB (Credits) Costs | (17) | 22
Total Benefit Costs | $ (15) | $ 26

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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