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Retirement Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Accumulated benefit obligation | $ 127 |  | $ 138 |  | $ 148
Fair value of plan assets | 295 |  | 277 |  | 259
Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  | 23 |  | 22
Fair value of plan assets | 182 |  | 22 |  |
Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 8 |  | 13 |  |
Cash and Cash Equivalents [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 81 |  | 1 |  |
Mutual Fund [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 189 | [1] | 166 | [2] |
Mutual Fund [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 65 | [3] | 21 | [4] |
Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 98 |  | 98 |  |
Fixed Income Securities [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 36 |  |  |  |
Level 1 [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 197 |  | 179 |  |
Level 1 [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 138 |  | 22 |  |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 8 |  | 13 |  |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 81 |  | 1 |  |
Level 1 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 189 | [1] | 166 | [2] |
Level 1 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 21 | [3] | 21 | [4] |
Level 1 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Level 1 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 36 |  |  |  |
Level 2 [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 98 |  | 98 |  |
Level 2 [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 44 |  | 0 |  |
Level 2 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Level 2 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Level 2 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 | [1] | 0 | [2] |
Level 2 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 44 | [3] | 0 | [4] |
Level 2 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 98 |  | 98 |  |
Level 2 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  |  |  |
Level 3 [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Level 3 [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Level 3 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Level 3 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Level 3 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 | [1] | 0 | [2] |
Level 3 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 | [3] | 0 | [4] |
Level 3 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Level 3 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  |  |  |
Funded Plans [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Projected benefit obligation | 22 |  | 23 |  |
Accumulated benefit obligation | 158 |  | 23 |  |
Fair value of plan assets | 182 |  | 22 |  | 20
Unfunded Plans [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Projected benefit obligation | 16 |  | 15 |  |
Accumulated benefit obligation | 16 |  | 17 |  | 19
Fair value of plan assets | $ 0 |  | $ 0 |  | $ 0
[1] | Primarily composed of market index funds as of December 31, 2024.
[2] | Primarily composed of market index funds as of December 31, 2023.
[3] | Comprised of approximately 100% equities as of December 31, 2024.
[4] | Comprised of approximately 100% equities as of December 31, 2023.

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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