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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Lessee, Operating Lease, Term of Contract	15 years
Operating Leases, Rent Expense, Contingent Rentals	$ 1,000,000	$ 4,000,000
Loss Contingency Accrual, at Carrying Value	30,000,000		$ 33,000,000
Amounts recorded in balance sheets for contingencies and current litigation not disclosed	0
Payments for Environmental Liabilities	6,000,000	$ 2,000,000
Accrual for Environmental Loss Contingencies	$ 380,000,000		$ 372,000,000
Sunoco, Inc. [Member]
Loss Contingency, Pending Claims, Number	6
Proposed Environmental Penalty	$ 200,000
Williams [Member]
Loss on Contract Termination for Default	410,000,000
Loss Contingency, Damages Sought, Value	10,000,000,000
Rover Pipeline LLC [Member]
Proposed Environmental Penalty	$ 2,600,000
Sunoco [Member]
Site Contingency, Number of Sites Needing Remediation	50
Federal [Member] | Sunoco Pipeline L.P. [Member]
Proposed Environmental Penalty	$ 7,000,000
State and Local Jurisdiction [Member] | Sunoco Pipeline L.P. [Member]
Proposed Environmental Penalty	1,000,000
Compensatory Damages [Member]
Gain Contingency, Unrecorded Amount	319,000,000
Final Judgement [Member]
Gain Contingency, Unrecorded Amount	536,000,000
Expense Reimbursement [Member]
Gain Contingency, Unrecorded Amount	1,000,000
Disgorgement [Member]
Gain Contingency, Unrecorded Amount	595,000,000
4.875% senior notes due 2023 [Member] | Sunoco LP [Member]
Senior Notes	$ 1,000,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.875%
5.500% senior notes due 2026 [Member] | Sunoco LP [Member]
Senior Notes	$ 800,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.50%
5.875% senior notes due 2028 [Member] | Sunoco LP [Member]
Senior Notes	$ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.875%
Minimum [Member]
Lessee, Operating Lease, Term of Contract	5 years
Maximum [Member]
Lessee, Operating Lease, Term of Contract	40 years

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