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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