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Retirement Benefits and Trusteed Assets (OPEB - Assumptions used in Determining the PBO and Net Pension Costs) (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated postretirement benefit obligation |  |  |
Ultimate health care trend rate |  |  | 4.50%
Other postretirement benefit costs |  |  |
Ultimate health care trend rate |  |  | 4.50%
Other postretirement benefit plan |  |  |
Accumulated postretirement benefit obligation |  |  |
Discount rate | 5.00% | 5.19% | 2.91%
Health care trend rate pre- 65 | 7.75% | 6.75% | 6.75%
Health care trend post- 65 | 8.25% | 7.25% | 7.25%
Ultimate health care trend rate | 4.50% | 4.50% | 4.50%
Other postretirement benefit costs |  |  |
Discount rate | 5.19% | 2.91% | 2.58%
Expected long-term rate of return on plan assets | 7.20% | 6.40% | 6.70%
Health care trend rate pre- 65 | 6.75% | 6.75% | 6.75%
Health care trend post- 65 | 7.25% | 7.25% | 7.25%
Ultimate health care trend rate | 4.50% | 4.50% | 4.50%

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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year Pre Sixty Five + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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