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Retirement Benefits (Obligations and Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Defined Benefit Plan, Benefit Obligation, Business Combination | $ 12 | $ 0
Nustar Acquisition |  |
Change in plan assets: |  |
Return on plan assets and other | 0 | 0
Pension Benefits |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 23 | 22
Service cost | 1 | 0
Interest cost | 6 | 1
Defined Benefit Plan, Benefit Obligation |  | 23
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 22 |
Defined Benefit Plan, Plan Assets, Amount | 182 | 22
Amounts recognized in the consolidated balance sheets consist of: |  |
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: |  |
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 | 138 | 148
Service cost | 0 | 0
Interest cost | 7 | 6
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment | (11) | 0
Benefits paid, net | (13) | (13)
Actuarial gain and other | (6) | (3)
Defined Benefit Plan, Benefit Obligation | 127 | 138
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 277 | 259
Return on plan assets and other | 29 | 29
Employer contributions | 2 | 2
Benefits paid, net | (13) | (13)
Defined Benefit Plan, Plan Assets, Amount | 295 | 277
Amount underfunded (overfunded) at end of period | (168) | (139)
Amounts recognized in the consolidated balance sheets consist of: |  |
Non-current assets | 185 | 155
Current liabilities | (3) | (2)
Non-current liabilities | (14) | (14)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | 168 | 139
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Net actuarial gain (loss) | (59) | (12)
Prior service credit | 25 | (3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | (34) | (15)
Funded Plans [Member] | Pension Benefits |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 23 |
Interest cost | 6 | 1
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0
Benefits paid, net | (37) | (1)
Actuarial gain and other | 13 | 1
Defined Benefit Plan, Benefit Obligation | 158 | 23
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 22 | 20
Return on plan assets and other | 13 | 2
Employer contributions | 5 | 1
Benefits paid, net | (36) | (1)
Defined Benefit Plan, Plan Assets, Amount | 182 | 22
Amount underfunded (overfunded) at end of period | (24) | 1
Amounts recognized in the consolidated balance sheets consist of: |  |
Non-current assets | 24 | 0
Current liabilities | 0 | 0
Non-current liabilities | 0 | (1)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | 24 |
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Net actuarial gain (loss) | (9) | 0
Prior service credit | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | (9) |
Defined Benefit Plan, Benefit Obligation, Business Combination | 152 | 0
Funded Plans [Member] | Pension Benefits | Nustar Acquisition |  |
Change in plan assets: |  |
Return on plan assets and other | 178 | 0
Unfunded Plans [Member] |  |
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Defined Benefit Plan, Benefit Obligation, Business Combination | 0 | 0
Unfunded Plans [Member] | Nustar Acquisition |  |
Change in plan assets: |  |
Return on plan assets and other | 0 | 0
Unfunded Plans [Member] | Pension Benefits |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 17 | 19
Service cost | 0 | 0
Interest cost | 1 | 1
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0
Benefits paid, net | (3) | (3)
Actuarial gain and other | 1 | 0
Defined Benefit Plan, Benefit Obligation | 16 | 17
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 | 16 | 17
Amounts recognized in the consolidated balance sheets consist of: |  |
Non-current assets | 0 | 0
Current liabilities | (3) | (3)
Non-current liabilities | (13) | (14)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (16) | (17)
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |
Net actuarial gain (loss) | (1) | (2)
Prior service credit | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | $ (1) | $ (2)

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