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Benefit Plans and Other Postretirement Benefits - Net Benefit Costs and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Benefits |  |  |
Annual periodic pension cost |  |  |
Service cost benefits earned | $ 3 | $ 5 | $ 7
Interest cost on benefit obligation | 48 | 50 | 41
Expected return on plan assets | (47) | (39) | (47)
Amortization of unrecognized net loss | 2 | 6 | 3
Curtailment expense | (6) | (1) | 14
Net periodic benefit cost | 0 | 21 | 18
Pension and other post retirement benefit obligations |  |  |
Benefit obligation at January 1 | 1,023 | 1,036 |
Service cost | 3 | 5 | 7
Interest cost | 48 | 50 | 41
Actuarial loss/(gain) | (35) | 22 |
Employee and retiree contributions | 0 | 0 |
Annuity purchase settlement | (50) | 0 |
Curtailment and special termination benefit loss | 0 | (2) |
Benefit payments | (83) | (89) |
Foreign exchange translation | (5) | 1 |
Benefit obligation at December 31 | 901 | 1,023 | 1,036
Fair value of plan assets for pension and other post retirement benefit |  |  |
Fair value of plan assets at January 1 | 851 | 844 |
Actual return on plan assets | 16 | 93 |
Employee and retiree contributions | 0 | 0 |
Employer contributions | 38 | 2 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (50) | 0 |
Benefit payments | (83) | (89) |
Foreign exchange translation | (5) | 1 |
Fair value of plan assets at December 31 | 767 | 851 | 844
Funded status at December 31 — excess of obligation over assets | (134) | (172) |
Other Postretirement Benefits Plan |  |  |
Annual periodic pension cost |  |  |
Service cost benefits earned | 0 | 0 |
Interest cost on benefit obligation | 3 | 4 | 2
Amortization of unrecognized net loss | (1) | 1 | 2
Amortization of unrecognized prior service cost | (3) | (8) | (8)
Net periodic benefit cost | (1) | (3) | (4)
Pension and other post retirement benefit obligations |  |  |
Benefit obligation at January 1 | 75 | 84 |
Service cost | 0 | 0 |
Interest cost | 3 | 4 | 2
Actuarial loss/(gain) | (1) | (5) |
Employee and retiree contributions | 3 | 4 |
Annuity purchase settlement | 0 | 0 |
Curtailment and special termination benefit loss | 0 | (1) |
Benefit payments | (10) | (11) |
Foreign exchange translation | 0 | 0 |
Benefit obligation at December 31 | 70 | 75 | 84
Fair value of plan assets for pension and other post retirement benefit |  |  |
Fair value of plan assets at January 1 | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employee and retiree contributions | 3 | 4 |
Employer contributions | 7 | 7 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 0 | 0 |
Benefit payments | (10) | (11) |
Foreign exchange translation | 0 | 0 |
Fair value of plan assets at December 31 | 0 | 0 | $ 0
Funded status at December 31 — excess of obligation over assets | $ (70) | $ (75) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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/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 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(1) -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)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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