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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The changes in the benefit obligation, the changes in fair value of plan assets, the funded status and the amounts recognized in the consolidated balance sheets for Sunoco’s Pension Plans and other postretirement benefit plans as of December 31, 2025 were as follows:
| December 31, 2025 |  | December 31, 2024
| Pension Plans |  | Other Postretirement Benefit Plans |  | Pension Plans |  | Other Postretirement Benefit Plans
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of period | $ | 137 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |
NuStar Acquisition | — |  |  | — |  |  | 152 |  |  | 12 |
Service cost | — |  |  | — |  |  | 1 |  |  | — |
Interest cost | 3 |  |  | — |  |  | 5 |  |  | 1 |
Plan amendments | — |  |  | — |  |  | — |  |  | (11) |
Benefits paid, net | (136) |  |  | — |  |  | (36) |  |  | — |
Actuarial (gain) loss and other | (4) |  |  | — |  |  | 15 |  |  | (1) |
Benefit obligation at end of period | — |  |  | 1 |  |  | 137 |  |  | 1 |
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of period | $ | 160 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
NuStar Acquisition | — |  |  | — |  |  | 178 |  |  | — |
Actual return on plan assets | 2 |  |  | — |  |  | 12 |  |  | — |
Employer contributions | 1 |  |  | — |  |  | 5 |  |  | — |
Benefits paid, net | (136) |  |  | — |  |  | (35) |  |  | — |
Fair value of plan assets at end of period | 27 |  |  | — |  |  | 160 |  |  | — |
Amount (overfunded) underfunded at end of period | $ | (27) |  |  | $ | 1 |  |  | $ | (23) |  |  | $ | 1 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |
Current assets | $ | 27 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Non-current assets | — |  |  | — |  |  | 24 |  |  | — |
Current liabilities | — |  |  | — |  |  | (1) |  |  | (1) |
Non-current liabilities | — |  |  | (1) |  |  | — |  |  | — |
| $ | 27 |  |  | $ | (1) |  |  | $ | 23 |  |  | $ | (1) |
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of: |  |  |  |  |  |  |
Net actuarial loss | $ | — |  |  | $ | — |  |  | $ | (9) |  |  | $ | — |
Prior service credit | — |  |  | — |  |  | — |  |  | 11 |
| $ | — |  |  | $ | — |  |  | $ | (9) |  |  | $ | 11 |

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