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Retirement Benefits (Obligations and Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Change in benefit obligation: |  |
Defined Benefit Plan, Plan Assets, Divestiture | $ 0 | $ 0
Defined Benefit Plan, Benefit Obligation, Divestiture | 0 | 0
Pension Benefits |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 22 | 50
Service cost | 0 | 0
Interest cost | 1 | 2
Defined Benefit Plan, Benefit Obligation |  | 22
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 20 |
Defined Benefit Plan, Plan Assets, Amount | 22 | 20
Amounts recognized in the consolidated balance sheets consist of: |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position |  | (2)
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 0
Other Postretirement Benefits |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 148 | 195
Service cost | 0 | 1
Interest cost | 6 | 4
Benefits paid, net | (13) | (14)
Actuarial gain and other | (3) | (38)
Defined Benefit Plan, Benefit Obligation | 138 | 148
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 259 | 311
Return on plan assets and other | 29 | (41)
Employer contributions | 2 | 3
Benefits paid, net | (13) | (14)
Defined Benefit Plan, Plan Assets, Amount | 277 | 259
Amount underfunded (overfunded) at end of period | (139) | (111)
Amounts recognized in the consolidated balance sheets consist of: |  |
Non-current assets | 155 | 127
Current liabilities | (2) | (2)
Non-current liabilities | (14) | (14)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | 139 | 111
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Net actuarial gain (loss) | (12) | 5
Prior service credit | (3) | (3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | (15) | 2
Funded Plans [Member] | Pension Benefits |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 22 |
Interest cost | 1 | 1
Benefits paid, net | (1) | (1)
Actuarial gain and other | 1 | (8)
Defined Benefit Plan, Plan Assets, Divestiture | 0 | (20)
Defined Benefit Plan, Benefit Obligation, Divestiture | 0 | (20)
Defined Benefit Plan, Benefit Obligation | 23 | 22
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 20 | 44
Return on plan assets and other | 2 | (4)
Employer contributions | 1 | 1
Benefits paid, net | (1) | (1)
Defined Benefit Plan, Plan Assets, Amount | 22 | 20
Amount underfunded (overfunded) at end of period | 1 | 2
Amounts recognized in the consolidated balance sheets consist of: |  |
Non-current assets | 0 | 0
Current liabilities | 0 | 0
Non-current liabilities | (1) | (2)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (1) |
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Net actuarial gain (loss) | 0 | 0
Prior service credit | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 0 |
Unfunded Plans [Member] |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Plan Assets, Divestiture | 0 | 0
Defined Benefit Plan, Benefit Obligation, Divestiture | 0 | (2)
Unfunded Plans [Member] | Pension Benefits |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 19 | 26
Service cost | 0 | 0
Interest cost | 1 | 1
Benefits paid, net | (3) | (3)
Actuarial gain and other | 0 | (3)
Defined Benefit Plan, Benefit Obligation | 17 | 19
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0
Return on plan assets and other | 0 | 0
Employer contributions | 0 | 0
Benefits paid, net | 0 | 0
Defined Benefit Plan, Plan Assets, Amount | 0 | 0
Amount underfunded (overfunded) at end of period | 17 | 19
Amounts recognized in the consolidated balance sheets consist of: |  |
Non-current assets | 0 | 0
Current liabilities | (3) | (3)
Non-current liabilities | (14) | (16)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (17) | (19)
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Net actuarial gain (loss) | (2) | (2)
Prior service credit | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | $ (2) | $ (2)

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