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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