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Pensions and Other Postretirement Benefits - Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in plan assets: |  |  |
Other current liabilities | $ (21) | $ (20) |
Pension Benefits |  |  |
Change in benefit obligations: |  |  |
Benefit obligation at beginning of year | 2,051 | 2,777 |
Service cost | 25 | 40 | $ 43
Interest cost | 108 | 67 | 55
Actuarial losses (gains) | 122 | (677) |
Plan amendments | 0 | (4) |
Benefits paid | (155) | (152) |
Benefit obligation at end of year | 2,151 | 2,051 | 2,777
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 2,260 | 2,861 |
Actual return on plan assets | 375 | (470) |
Employer contributions | 23 | 21 |
Benefits paid | (155) | (152) |
Fair value of plan assets at end of year | 2,503 | 2,260 | 2,861
Funded status at end of year | 352 | 209 |
Other assets | 652 | 484 |
Other current liabilities | (21) | (20) |
Other liabilities | (279) | (255) |
Net amount recognized | 352 | 209 |
Net (gain) loss | 574 | 623 |
Prior service benefit | (5) | (6) |
Other Postretirement Benefits |  |  |
Change in benefit obligations: |  |  |
Benefit obligation at beginning of year | 326 | 417 |
Service cost | 4 | 6 | 6
Interest cost | 17 | 9 | 7
Actuarial losses (gains) | 1 | (70) |
Plan amendments | (5) | 0 |
Benefits paid | (33) | (36) |
Benefit obligation at end of year | 310 | 326 | 417
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 122 | 173 |
Actual return on plan assets | 21 | (28) |
Employer contributions | 28 | 13 |
Benefits paid | (33) | (36) |
Fair value of plan assets at end of year | 138 | 122 | $ 173
Funded status at end of year | (172) | (204) |
Other assets | 0 | 0 |
Other current liabilities | 0 | 0 |
Other liabilities | (172) | (204) |
Net amount recognized | (172) | (204) |
Net (gain) loss | (28) | (19) |
Prior service benefit | $ (156) | $ (177) |

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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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