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Commitments and Contingencies - Other Lawsuits (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($)
Galveston Bay Refinery Fire |
Loss Contingencies [Line Items] |
Number of lawsuits | 4
Pending Litigation | Emergency Pricing And Consumer Protection Laws |
Loss Contingencies [Line Items] |
Plaintiff | Commonwealth of Kentucky
Alleged amount overcharged from customers | $ 89
Loss contingency, period of occurrence | during September and October 2005

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