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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 28, 2018 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Loss Contingency Accrual, at Carrying Value |  | $ 43,000,000 |  | $ 55,000,000
Amounts recorded in balance sheets for contingencies and current litigation not disclosed |  | 0 |  |
Accrual for Environmental Loss Contingencies |  | $ 337,000,000 |  | $ 337,000,000
Civil penalties | $ 12,600,000 |  |  |
Sunoco, Inc. [Member] |  |  |  |
Loss Contingency, Pending Claims, Number |  | 5 |  |
Payments for Environmental Liabilities |  | $ 6,000,000 | $ 6,000,000 |
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 |  |
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 |  |
Compensatory Damages [Member] |  |  |  |
Gain Contingency, Unrecorded Amount |  | $ 319,000,000 |  |
Final Judgement [Member] |  |  |  |
Gain Contingency, Unrecorded Amount |  | 536,000,000 |  |
Expense Reimbursement [Member] |  |  |  |
Gain Contingency, Unrecorded Amount |  | 1,000,000 |  |
Disgorgement [Member] |  |  |  |
Gain Contingency, Unrecorded Amount |  | $ 595,000,000 |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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