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Retirement Benefits - Plan Target and Actual Asset Allocation (Details) | Dec. 31, 2022 | Dec. 31, 2021
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Equity securities | All Pension Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Mix | 25.00% | 26.00%
Actual Mix | 25.00% | 26.00%
Equity securities | Postretirement Health Care Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Mix | 28.00% | 28.00%
Actual Mix | 28.00% | 29.00%
Fixed income securities | All Pension Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Mix | 57.00% | 57.00%
Actual Mix | 56.00% | 58.00%
Fixed income securities | Postretirement Health Care Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Mix | 52.00% | 52.00%
Actual Mix | 52.00% | 53.00%
Cash and other investments | All Pension Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Mix | 18.00% | 17.00%
Actual Mix | 19.00% | 16.00%
Cash and other investments | Postretirement Health Care Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Mix | 20.00% | 20.00%
Actual Mix | 20.00% | 18.00%

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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