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Commitments and Contingencies - Other Lawsuits (Details) $ in Millions	3 Months Ended
	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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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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