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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details) $ in Millions		3 Months Ended		12 Months Ended
	Aug. 01, 2020 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Payments for Environmental Liabilities		$ 4.0	$ 6.0
Document Period End Date		Mar. 31, 2022
Accrual for Environmental Loss Contingencies		$ 289.0		$ 293.0
Loss Contingency, Estimate of Possible Loss		600.0
Proposed Civil Penalty
Payments for Legal Settlements		20.0
Litigation Settlement, Expense		40.0
Related To Deductibles
Loss Contingency Accrual, at Carrying Value		$ 163.0		144.0
Sunoco, Inc. [Member]
Loss Contingency, Pending Claims, Number		4
Sunoco [Member]
Site Contingency, Number of Sites Needing Remediation		34
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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