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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | $ 37 | $ 36 | $ 113 | $ 106
Interest Cost | 35 | 48 | 105 | 144
Expected Return on Plan Assets | (119) | (111) | (357) | (332)
Amortization of Prior Service Cost | 0 | (3) | 0 | (8)
Amortization of Actuarial Loss | 26 | 23 | 77 | 69
Non-Operating Pension and OPEB (Credits) Costs | (58) | (43) | (175) | (127)
Total Benefit (Credits) Costs | (21) | (7) | (62) | (21)
OPEB [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 3 | 2 | 7 | 7
Interest Cost | 5 | 8 | 16 | 25
Expected Return on Plan Assets | (10) | (10) | (31) | (29)
Amortization of Prior Service Cost | (33) | (32) | (97) | (96)
Amortization of Actuarial Loss | 11 | 12 | 33 | 35
Non-Operating Pension and OPEB (Credits) Costs | (27) | (22) | (79) | (65)
Total Benefit (Credits) Costs | $ (24) | $ (20) | $ (72) | $ (58)

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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=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: 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=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: 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=118255775&loc=d3e2709-114920 + Details
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