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Retirement Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Accumulated benefit obligation | $ 138 |  | $ 148 |  | $ 195
Fair value of plan assets | 277 |  | 259 |  | 311
Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  | 22 |  | 50
Fair value of plan assets | 22 |  | 20 |  |
Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 13 |  | 19 |  |
Cash and Cash Equivalents [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 2 |  | 2 |  |
Mutual Fund [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 166 | [1] | 146 | [2] |
Mutual Fund [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 20 | [3] | 18 | [4] |
Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 98 |  | 94 |  |
Level 1 [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 179 |  | 165 |  |
Level 1 [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 22 |  | 20 |  |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 13 |  | 19 |  |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 2 |  | 2 |  |
Level 1 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 166 | [1] | 146 | [2] |
Level 1 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 20 | [3] | 18 | [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 2 [Member] | Other Postretirement Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 98 |  | 94 |  |
Level 2 [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 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 | 0 | [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 |  | 94 |  |
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 |  |
Funded Plans [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Projected benefit obligation | 23 |  | 22 |  |
Accumulated benefit obligation | 23 |  | 22 |  |
Fair value of plan assets | 22 |  | 20 |  | 44
Unfunded Plans [Member] | Pension Benefits |  |  |  |  |
Fair Value of Plan Assets [Line Items] |  |  |  |  |
Projected benefit obligation | 15 |  | 19 |  |
Accumulated benefit obligation | 17 |  | 19 |  | 26
Fair value of plan assets | $ 0 |  | $ 0 |  | $ 0
[1] | Primarily composed of market index funds as of December 31, 2023.
[2] | Primarily composed of market index funds as of December 31, 2022.
[3] | Comprised of approximately 100% equities as of December 31, 2023.
[4] | Comprised of approximately 100% equities as of December 31, 2022.

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