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EMPLOYEE BENEFIT PLANS (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost for benefits earned | $ 379 | $ 575 | $ 587
Interest cost | 913 | 692 | 645
Expected return on plan assets | (981) | (1,189) | (1,046)
Amortization of prior service cost | (4) | (4) | (6)
Amortization of net actuarial gain (loss) | 1 | 2 | 6
Net periodic benefit cost | 308 | 76 | 186
Less: transfer to regulatory account | 25 | 254 | 147
Total expense recognized | 333 | 330 | 333
PBOP Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost for benefits earned | 38 | 62 | 63
Interest cost | 73 | 53 | 51
Expected return on plan assets | (132) | (130) | (137)
Amortization of prior service cost | 3 | 7 | 14
Amortization of net actuarial gain (loss) | (19) | (40) | (33)
Special termination benefits | 0 | 22 | 0
Net periodic benefit cost | $ (37) | $ (26) | $ (42)

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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/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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