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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Payments for Environmental Liabilities |  | $ 7.0 | $ 9.0 | $ 15.0 | $ 15.0 |
Document Period End Date |  |  |  | Jun. 30, 2020 |  |
Loss Contingency Accrual, at Carrying Value |  | 92.0 |  | $ 92.0 |  | $ 120.0
Loss Contingency, Estimate of Possible Loss |  | 80.0 |  | 80.0 |  |
Accrual for Environmental Loss Contingencies |  | $ 304.0 |  | $ 304.0 |  | $ 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 |  | 30 |  | 30 |  |
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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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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