Contingent Liabilities (Details Textual) (USD $)	1 Months Ended
	Jun. 30, 2014	Apr. 18, 2014	Dec. 11, 2013
Loss Contingencies [Line Items]
Proceeds from Legal Settlements	$ 42,000,000
Accrued Environmental Loss liabilities	45,000,000
Loss Contingency, Range of Possible Loss	32,000,000
Customer Refund Paid		118,000,000
Notice of Penalty			99,000
Environmental Protection Agency [Member]
Loss Contingencies [Line Items]
Accrued Environmental Loss liabilities	11,000,000
Former Operations
Loss Contingencies [Line Items]
Accrued Environmental Loss liabilities	26,000,000
Natural gas underground storage facilities
Loss Contingencies [Line Items]
Accrued Environmental Loss liabilities	8,000,000
Gulf Liquids
Loss Contingencies [Line Items]
Estimated Litigation Liability, Current	$ 13,000,000