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Guarantees (Details 5) (USD $)
Dec. 31, 2013
Guarantor Obligations [Line Items]  
Amount of hedging obligations guaranteed reflected on balance sheet $ 4,800,000
Guarantor obligations, maximum exposure, undiscounted 54,400,000
Fixed maximum amounts guaranteed by year 2014 32,500,000
Fixed maximum amounts guaranteed by year 2015 2,100,000
Fixed maximum amounts guaranteed by year 2016 700,000
Fixed maximum amounts guaranteed by year 2017 600,000
Fixed maximum amounts guaranteed by year 2018 500,000
Fixed maximum amounts guaranteed by year 2019 500,000
Expires on a specified number of days after the receipt of written notice 13,500,000
Fixed maximum amounts guaranteed by year no maturity date 4,000,000
Amount outstanding under guarantees that are reflected on balance sheet 200,000
Letters of credit 36,000,000
Outstanding letters of credit 0
Natural gas transportation and storage agreement fixed maximum amount of performance guarantee of a related party 5,000,000
The amount outstanding by a related party under the guarantee 800,000
Amount of surety bonds outstanding $ 516,000,000