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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details) $ in Millions		3 Months Ended		9 Months Ended
	Jan. 01, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Payments for Environmental Liabilities		$ 7.0	$ 16.0	$ 22.0	$ 31.0
Document Period End Date				Sep. 30, 2020
Loss Contingency Accrual, at Carrying Value		86.0		$ 86.0		$ 120.0
Loss Contingency, Estimate of Possible Loss		80.0		80.0
Accrual for Environmental Loss Contingencies		$ 298.0		$ 298.0		$ 320.0
Sunoco, Inc. [Member]
Loss Contingency, Pending Claims, Number		5		5
Revolution Pipeline [Member]
Payments for Legal Settlements	$ 2.0
SPLP [Member]
Proposed Environmental Penalty				$ 5.4
SPLP and Mid-Valley Pipeline [Member]
Proposed Environmental Penalty				$ 1.0
Sunoco [Member]
Site Contingency, Number of Sites Needing Remediation		31		31
PES [Member]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest		7.40%
Williams Litigation [Member]
Loss Contingency, Damages Sought, Value				$ 410.0
Civil Penalties [Member] | Revolution Pipeline [Member]
Payments for Legal Settlements	$ 28.6
PES [Member]
Notes Receivable, Related Parties			$ 75.0		$ 75.0
Repayment of Notes Receivable from Related Parties				12.0
Loans and Leases Receivable, Allowance		$ 63.0		$ 63.0

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