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Pension and Other Retiree Benefits - Weighted Average Asset Allocation (Details) - Pension | Dec. 31, 2023 | Dec. 31, 2022
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U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 100.00% | 100.00%
U.S. | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 37.00% | 35.00%
U.S. | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 57.00% | 58.00%
U.S. | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 4.00% | 4.00%
U.S. | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations | [1] | 2.00% | 3.00%
International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 100.00% | 100.00%
International | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 7.00% | 9.00%
International | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 63.00% | 56.00%
International | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 3.00% | 3.00%
International | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations | [1] | 27.00% | 32.00%
[1] | Multi-strategy hedge funds, commodity linked funds, private equity funds, and cash and cash equivalents for certain of our plans.

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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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