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Commitments and Contingencies - Other Lawsuits (Details) - Emergency Pricing And Consumer Protection Laws $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Pending Litigation
Loss Contingencies [Line Items]
Damages sought, value	$ 89
Settled Litigation
Loss Contingencies [Line Items]
Name of plaintiff	Commonwealth of Kentucky
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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