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Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2017
Accounting Policies [Abstract]
Restricted Cash, Policy [Policy Text Block]	Restricted Cash: Restricted cash represents amounts designated for uses other than current operations and includes $2 million related to the Letter of Credit Facility, and $1 million related to cash collateral for other corporate purposes as of September 30, 2017.