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Pensions and Other Postretirement Benefits - Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets: |  |  |
Other current liabilities | $ (21) | $ (21) |
Other liabilities | (252) | (279) |
Pension Benefits |  |  |
Change in benefit obligations: |  |  |
Benefit obligation at beginning of year | 2,151 | 2,051 |
Service cost | 26 | 25 | $ 40
Interest cost | 107 | 108 | 67
Actuarial (gains) losses | (91) | 122 |
Plan amendments | 0 | 0 |
Benefits paid | (155) | (155) |
Curtailment | 0 | 0 |
Benefit obligation at end of year | 2,038 | 2,151 | 2,051
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 2,503 | 2,260 |
Actual return on plan assets | 181 | 375 |
Employer contributions | 22 | 23 |
Benefits paid | (155) | (155) |
Fair value of plan assets at end of year | 2,551 | 2,503 | 2,260
Funded status at end of year | 513 | 352 |
Other assets | 786 | 652 |
Other current liabilities | (21) | (21) |
Other liabilities | (252) | (279) |
Net amount recognized | 513 | 352 |
Net (gain) loss | 488 | 574 |
Prior service benefit | (4) | (5) |
Other Postretirement Benefits |  |  |
Change in benefit obligations: |  |  |
Benefit obligation at beginning of year | 310 | 326 |
Service cost | 4 | 4 | 6
Interest cost | 15 | 17 | 9
Actuarial (gains) losses | (21) | 1 |
Plan amendments | 0 | (5) |
Benefits paid | (32) | (33) |
Curtailment | 2 | 0 |
Benefit obligation at end of year | 278 | 310 | 326
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 138 | 122 |
Actual return on plan assets | 21 | 21 |
Employer contributions | 18 | 28 |
Benefits paid | (32) | (33) |
Fair value of plan assets at end of year | 145 | 138 | $ 122
Funded status at end of year | (133) | (172) |
Other assets | 0 | 0 |
Other current liabilities | 0 | 0 |
Other liabilities | (133) | (172) |
Net amount recognized | (133) | (172) |
Net (gain) loss | (56) | (28) |
Prior service benefit | $ (113) | $ (156) |

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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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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