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Unit-Based Compensation - Additional Information Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash unit-based compensation expense | $ 17 | $ 17 | $ 14
Sun LP Cash Restricted |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Units granted (in units) | 134,225,000,000 |  |
Phantom Share Units (PSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of phantom units vested in period | $ 23 | 30 | $ 22
Unrecognized compensation expense from nonvested phantom units | 43 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested | $ 86 | $ 96 |
Weighted average period over which compensation expense for nonvested phantom units will be recognized | 4 years |  |
Units granted (in units) | 584,303 | 399,377 |
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 |  |

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