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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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 | 5.19% | 2.91% | 2.58%
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%
Other postretirement benefit costs |  |  |
Discount rate | 2.91% | 2.58% | 3.29%
Expected long-term rate of return on plan assets | 6.40% | 6.70% | 7.20%
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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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