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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)