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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Operating Leases, Rent Expense |  |  | $ 48,000,000 | $ 47,000,000 | $ 45,000,000
Payments for Environmental Liabilities |  |  | 28,000,000 | 29,000,000 |
Total environmental liabilities |  | $ 306,000,000 | $ 293,000,000 | 306,000,000 |
Site Contingency, Number of Sites Needing Remediation |  |  | 34 |  |
Loss Contingency, Damages Awarded, Value |  | 74,800,000 | $ 80,700,000 |  |
Loss Contingency, Damages Sought, Value | $ 410,000,000 |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | $ 550,000,000 |  |
Number of litigation cases |  |  | 5 |  |
Rover Pipeline |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party |  |  | $ 40,000,000 |  |
Punitive Damages [Member] |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  | 75,000,000 |  |
Related To Deductibles [Member] |  |  |  |  |
Loss Contingency Accrual |  | $ 101,000,000 | $ 144,000,000 | $ 101,000,000 |

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