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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Operating Leases, Rent Expense |  |  |  |  | $ 47,000,000 | $ 45,000,000 | $ 46,000,000
Payments for Environmental Liabilities |  |  |  |  | 29,000,000 | 39,000,000 |
Total environmental liabilities | $ 306,000,000 |  |  |  | $ 306,000,000 | 320,000,000 |
Site Contingency, Number of Sites Needing Remediation | 35 |  |  |  | 35 |  |
Long-term Debt | $ 51,438,000,000 |  |  |  | $ 51,438,000,000 | 51,054,000,000 |
Loss Contingency, Damages Awarded, Value | 80,700,000 | $ 74,800,000 |  |  |  |  |
Payments for Legal Settlements |  |  | $ 5,400,000 |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  | $ 410,000,000 |  |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | 80,000,000 |  |  |  | 80,000,000 |  |
PES [Member] |  |  |  |  |  |  |
Repayment of Notes Receivable from Related Parties |  |  |  |  | 12,000,000 |  |
Loans and Leases Receivable, Allowance | 63,000,000 |  |  |  | $ 63,000,000 |  |
PES [Member] |  |  |  |  |  |  |
Limited Partner interest in the Partnership, percentage |  |  |  |  | 7.40% |  |
PES [Member] |  |  |  |  |  |  |
Debt Instrument, Debt Default, Amount | 75,000,000 |  |  |  | $ 75,000,000 |  |
Sunoco LP [Member] |  |  |  |  |  |  |
Long-term Debt | 3,112,000,000 |  |  |  | 3,112,000,000 | 3,071,000,000 |
Punitive Damages [Member] |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  |  | 75,000,000 |  |
Civil Penalty [Member] |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  |  | 28,600,000 |  |
Community Environmental Project [Member] |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  |  | 2,000,000 |  |
Related To Deductibles [Member] |  |  |  |  |  |  |
Loss Contingency Accrual | 77,000,000 |  |  |  | 77,000,000 | 120,000,000 |
4.875% senior notes due 2023 [Member] | Sunoco LP [Member] |  |  |  |  |  |  |
Senior Notes | 436,000,000 |  |  |  | 436,000,000 | 1,000,000,000 |
5.500% senior notes due 2026 [Member] | Sunoco LP [Member] |  |  |  |  |  |  |
Senior Notes | 800,000,000 |  |  |  | 800,000,000 | 800,000,000 |
5.875% senior notes due 2028 [Member] | Sunoco LP [Member] |  |  |  |  |  |  |
Senior Notes | $ 400,000,000 |  |  |  | $ 400,000,000 | $ 400,000,000 |

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