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Retirement Benefits and Trusteed Assets (OPEB - Target Allocations of Plan Assets) (Details) - Other postretirement benefit plan | Dec. 31, 2023
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Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage of assets | 100.00%
U.S. Large Cap Equity Securities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage of assets | 5.00%
Non-U.S. Equity Securities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage of assets | 4.00%
Fixed Income Securities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage of assets | 61.00%
Hedge Funds and Similar Investments |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage of assets | 9.00%
Private Equity and Other |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage of assets | 21.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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