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Unit-Based Compensation - Additional Information Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash unit-based compensation expense | $ 19 | $ 17 | $ 17
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number | 303,179 |  |
Sun LP Cash Restricted |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Units granted (in units) | 217,432 | 134,225 |
Phantom Share Units (PSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of phantom units vested in period | $ 16 | $ 14 | $ 16
Unrecognized compensation expense from nonvested phantom units | $ 68 |  |
Units granted (in units) | 730,078 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms | 3 years 2 months 1 day |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | 1,771,372 | 1,542,700 |
Phantom Share Units (PSUs) [Member] | SunocoCorp |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of phantom units vested in period | $ 9 |  |
Unrecognized compensation expense from nonvested phantom units | $ 9 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms | 3 years 9 months 18 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | 183,813 | 0 |
Phantom Share Units (PSUs) [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage of phantom unit awards | 60.00% |  |
Vesting period for phantom unit awards | 3 years |  |
Phantom Share Units (PSUs) [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage of phantom unit awards | 40.00% |  |
Vesting period for phantom unit awards | 5 years |  |
SunocoCorp Cash Restricted Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for phantom unit awards | 3 years |  |
Units granted (in units) | 61,171 |  |

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