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Retirement Benefits (Accumulated Benefit Obligation In Excess of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation |  | $ 50 | $ 55
Fair value of plan assets | $ 20 | 44 |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | 148 | 195 | 208
Fair value of plan assets | 259 | 311 | 291
Funded Plans [Member] | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 22 | 50 |
Accumulated benefit obligation | 22 | 50 |
Fair value of plan assets | 20 | 44 | 45
Unfunded Plans [Member] | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 19 | 26 |
Accumulated benefit obligation | 19 | 26 | 31
Fair value of plan assets | $ 0 | $ 0 | $ 0

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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