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RETIREMENT AND DEFERRED COMPENSATION PLANS - Components of Net Periodic Cost and Underlying Weighted Average Actuarial Assumptions Used for Pension and Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost for the Years Ended December 31 |  |  |
Salary increases | 4.70% | 4.90% | 4.50%
Expected return on assets | 4.70% | 1.90% | 1.50%
Pension Benefits |  |  |
Components of Net Periodic Benefit Cost |  |  |
Service cost | $ 1 | $ 2 | $ 3
Interest cost | 5 | 3 | 3
Expected return on assets | (7) | (4) | (4)
Amortization of loss | 0 | 0 | 0
Settlement loss | 0 | 0 | 0
Net periodic benefit cost | $ (1) | $ 1 | $ 2
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost for the Years Ended December 31 |  |  |
Discount rate | 5.00% | 1.80% | 1.40%
Postretirement Benefits |  |  |
Components of Net Periodic Benefit Cost |  |  |
Service cost | $ 1 | $ 1 | $ 1
Interest cost | 1 | 0 | 0
Expected return on assets | 0 | 0 | 0
Amortization of loss | (2) | (1) | (1)
Settlement loss | 0 | 0 | 0
Net periodic benefit cost | $ 0 | $ 0 | $ 0
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost for the Years Ended December 31 |  |  |
Discount rate | 5.29% | 2.57% | 2.06%
Healthcare cost trend |  |  |
Initial | 6.50% | 6.25% | 6.00%
Ultimate in 2030 | 5.25% | 5.00% | 5.00%

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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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