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Employee Benefit Plans - Asset Allocation (Details) | Dec. 31, 2023 | Dec. 31, 2022
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Pension Benefits |  |
Employee benefit plans |  |
Actual Asset Allocations: | 100.00% | 100.00%
Target Asset Allocations: | 100.00% | 100.00%
Pension Benefits | Equity securities |  |
Employee benefit plans |  |
Actual Asset Allocations: | 56.00% | 56.00%
Target Asset Allocations: | 60.00% | 60.00%
Pension Benefits | Debt securities |  |
Employee benefit plans |  |
Actual Asset Allocations: | 39.00% | 39.00%
Target Asset Allocations: | 40.00% | 40.00%
Pension Benefits | Real Estate Funds |  |
Employee benefit plans |  |
Actual Asset Allocations: | 5.00% | 5.00%
Pension Benefits | Cash equivalents |  |
Employee benefit plans |  |
Actual Asset Allocations: | 0.00% | 0.00%
Post-Retirement Medical Benefits |  |
Employee benefit plans |  |
Actual Asset Allocations: | 100.00% | 100.00%
Target Asset Allocations: | 100.00% | 100.00%
Post-Retirement Medical Benefits | Equity securities |  |
Employee benefit plans |  |
Actual Asset Allocations: | 60.00% | 59.00%
Target Asset Allocations: | 60.00% | 60.00%
Post-Retirement Medical Benefits | Debt securities |  |
Employee benefit plans |  |
Actual Asset Allocations: | 39.00% | 39.00%
Target Asset Allocations: | 40.00% | 40.00%
Post-Retirement Medical Benefits | Real Estate Funds |  |
Employee benefit plans |  |
Actual Asset Allocations: | 0.00% | 0.00%
Post-Retirement Medical Benefits | Cash equivalents |  |
Employee benefit plans |  |
Actual Asset Allocations: | 1.00% | 2.00%

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- Definition Percentage of target 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/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 (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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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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