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Amount of loss contingency liability.

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Cash outflows made during the period for environmental remediation activities.

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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Narrative) (Details)	3 Months Ended				12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Operating Leases, Rent Expense					$ 47,000,000	$ 45,000,000	$ 46,000,000
Payments for Environmental Liabilities					29,000,000	39,000,000
Total environmental liabilities	$ 306,000,000				$ 306,000,000	320,000,000
Site Contingency, Number of Sites Needing Remediation	35				35
Long-term Debt	$ 51,438,000,000				$ 51,438,000,000	51,054,000,000
Loss Contingency, Damages Awarded, Value	80,700,000	$ 74,800,000
Payments for Legal Settlements			$ 5,400,000
Loss Contingency, Damages Sought, Value				$ 410,000,000
Loss Contingency, Range of Possible Loss, Portion Not Accrued	80,000,000				80,000,000
PES [Member]
Repayment of Notes Receivable from Related Parties					12,000,000
Loans and Leases Receivable, Allowance	63,000,000				$ 63,000,000
PES [Member]
Limited Partner interest in the Partnership, percentage					7.40%
PES [Member]
Debt Instrument, Debt Default, Amount	75,000,000				$ 75,000,000
Sunoco LP [Member]
Long-term Debt	3,112,000,000				3,112,000,000	3,071,000,000
Punitive Damages [Member]
Loss Contingency, Damages Awarded, Value					75,000,000
Civil Penalty [Member]
Loss Contingency, Damages Awarded, Value					28,600,000
Community Environmental Project [Member]
Loss Contingency, Damages Awarded, Value					2,000,000
Related To Deductibles [Member]
Loss Contingency Accrual	77,000,000				77,000,000	120,000,000
4.875% senior notes due 2023 [Member] \| Sunoco LP [Member]
Senior Notes	436,000,000				436,000,000	1,000,000,000
5.500% senior notes due 2026 [Member] \| Sunoco LP [Member]
Senior Notes	800,000,000				800,000,000	800,000,000
5.875% senior notes due 2028 [Member] \| Sunoco LP [Member]
Senior Notes	$ 400,000,000				$ 400,000,000	$ 400,000,000