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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Document Period End Date |  |  |  | Sep. 30, 2019 |  |  |
Loss Contingency Accrual, at Carrying Value |  | $ 61,000,000 |  | $ 61,000,000 |  |  | $ 55,000,000
Amounts recorded in balance sheets for contingencies and current litigation not disclosed |  | 0 |  | 0 |  |  |
Accrual for Environmental Loss Contingencies |  | $ 322,000,000 |  | $ 322,000,000 |  |  | $ 337,000,000
Civil penalties | $ 12,600,000 |  |  |  |  |  |
PES [Member] |  |  |  |  |  |  |
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest |  | 7.40% |  |  |  |  |
Notes Receivable, Related Parties |  |  |  |  |  | $ 75,000,000 |
Sunoco, Inc. [Member] |  |  |  |  |  |  |
Loss Contingency, Pending Claims, Number |  | 5 |  | 5 |  |  |
Payments for Environmental Liabilities |  | $ 16,000,000 | $ 17,000,000 | $ 31,000,000 | $ 32,000,000 |  |
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 |  |  |
SPLP [Member] |  |  |  |  |  |  |
Proposed Environmental Penalty |  |  |  | 5,400,000 |  |  |
SPLP and Mid-Valley Pipeline [Member] |  |  |  |  |  |  |
Proposed Environmental Penalty |  |  |  | 1,000,000 |  |  |
ET [Member] |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  | 8,500,000 |  |  |
Legal Fees |  |  |  | $ 4,500,000 |  |  |
Sunoco [Member] |  |  |  |  |  |  |
Site Contingency, Number of Sites Needing Remediation |  | 38 |  | 38 |  |  |
Compensatory Damages [Member] |  |  |  |  |  |  |
Gain Contingency, Unrecorded Amount |  | $ 319,000,000 |  | $ 319,000,000 |  |  |
Final Judgement [Member] |  |  |  |  |  |  |
Gain Contingency, Unrecorded Amount |  | 536,000,000 |  | 536,000,000 |  |  |
Expense Reimbursement [Member] |  |  |  |  |  |  |
Gain Contingency, Unrecorded Amount |  | 1,000,000 |  | 1,000,000 |  |  |
Disgorgement [Member] |  |  |  |  |  |  |
Gain Contingency, Unrecorded Amount |  | $ 595,000,000 |  | $ 595,000,000 |  |  |

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