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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details) $ in Millions		6 Months Ended	9 Months Ended
	Aug. 01, 2020 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Payments for Environmental Liabilities			$ 18.0	$ 22.0
Document Period End Date			Sep. 30, 2021
Accrual for Environmental Loss Contingencies			$ 297.0		$ 306.0
Loss Contingency, Estimate of Possible Loss			80.0
Related To Deductibles
Loss Contingency Accrual, at Carrying Value			$ 130.0		$ 101.0
Sunoco, Inc. [Member]
Loss Contingency, Pending Claims, Number			5
Sunoco [Member]
Site Contingency, Number of Sites Needing Remediation			33
Williams Litigation [Member]
Loss Contingency, Damages Sought, Value			$ 410.0
Cline Class Action | Actual Damages
Payments for Legal Settlements	$ 74.8	$ 80.7
Cline Class Action | punitive damages
Payments for Legal Settlements		$ 75.0

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