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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Lessee, Operating Lease, Term of Contract |  |  |  | 40 years |  |
Payments for Environmental Liabilities |  |  |  | $ 48,000,000 | $ 37,000,000 |
Operating leases rent expense | [1] |  |  | 139,000,000 | 171,000,000 | $ 161,000,000
Amounts recorded in balance sheets for contingencies and current litigation not disclosed |  |  |  | 0 |  |
Total environmental liabilities |  |  |  | 337,000,000 | 372,000,000 |
Operating Leases, Rent Expense, Contingent Rentals |  |  |  | $ 4,000,000 | 16,000,000 | $ 18,000,000
Site Contingency, Number of Sites Needing Remediation |  |  |  | 41 |  |
Long-term Debt |  |  |  | $ 46,028,000,000 | 44,084,000,000 |
Sunoco LP [Member] |  |  |  |  |  |
Long-term Debt |  |  |  | 2,984,000,000 | 4,287,000,000 |
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 |  |
Related To Deductibles [Member] |  |  |  |  |  |
Accrual for loss contingency |  |  |  | $ 55,000,000 | 56,000,000 |
6.375% Senior Notes due April 2023 [Member] | Sunoco LP [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.375% |  | 6.38% |  |
Senior Notes |  | $ 800,000,000 |  | $ 0 | 800,000,000 |
6.25% Senior Notes due 2021 [Member] | Sunoco LP [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.25% |  | 6.25% |  |
Senior Notes |  | $ 800,000,000 |  | $ 0 | 800,000,000 |
4.875% senior notes due 2023 [Member] | Sunoco LP [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875% |  |  |  |
Senior Notes |  | $ 1,000,000,000 |  | 1,000,000,000 | 0 |
5.500% senior notes due 2026 [Member] | Sunoco LP [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.50% |  |  |  |
Senior Notes |  | $ 800,000,000 |  | 800,000,000 | 0 |
5.875% senior notes due 2028 [Member] | Sunoco LP [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.875% |  |  |  |
Senior Notes |  | $ 400,000,000 |  | $ 400,000,000 | $ 0 |
PENNSYLVANIA |  |  |  |  |  |
Civil penalties |  | $ 12,600,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract |  |  |  | 5 years |  |
Maximum [Member] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract |  |  |  | 15 years |  |
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 |  |
Compensatory Damages [Member] |  |  |  |  |  |
Gain Contingency, Unrecorded Amount |  |  |  | $ 319,000,000 |  |
[1] | Includes contingent rentals totaling $4 million, $16 million and $18 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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