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Pension, OPEB and Savings Plans (Components Of Net Periodic Benefit Cost) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | $ 151 | $ 141 | $ 123
Interest Cost | 140 | 192 | 218
Expected Return on Plan Assets | (476) | (443) | (408)
Amortization of Prior Service Cost | 0 | (10) | (18)
Amortization of Net Actuarial Gain (Loss) | 103 | 92 | 96
Non-Operating Pension and Other Postretirement Plan (Credits) Costs | (233) | (169) | (112)
Net Periodic Benefit Cost | (82) | (28) | 11
Total Benefit Costs, Including Effect of Regulatory Asset | (82) | (28) | 11
Other Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | 9 | 9 | 10
Interest Cost | 22 | 34 | 45
Expected Return on Plan Assets | (42) | (39) | (36)
Amortization of Prior Service Cost | (129) | (128) | (128)
Amortization of Net Actuarial Gain (Loss) | 44 | 47 | 50
Non-Operating Pension and Other Postretirement Plan (Credits) Costs | (105) | (86) | (69)
Net Periodic Benefit Cost | (96) | (77) | (59)
Total Benefit Costs, Including Effect of Regulatory Asset | $ (96) | $ (77) | $ (59)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: 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=123453770&loc=SL108413299-114919 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)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: 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=123450688&loc=d3e4179-114921 Reference 4: 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=123450688&loc=d3e4587-114921 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)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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