Gas Stored Underground And Gas Receivables And Payables	6 Months Ended
Jun. 30, 2013
Gas Stored Underground and Gas Receivables and Payable [Abstract]
Gas Stored Underground and Gas Receivables and Payable [Text Block]	Note 4: Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables Subsidiaries of the Partnership provide storage services whereby they store gas or NGLs on behalf of customers and also periodically hold customer gas under parking and lending (PAL) services. Since the customers retain title to the gas held by the Partnership in providing these services, the Partnership does not record the related gas on its balance sheet. The Partnership held for storage or under PAL agreements approximately 115.4 trillion British thermal units (TBtu) of gas owned by third parties as of June 30, 2013. Assuming an average market price during June 2013 of $3.81 per million British thermal units (MMBtu), the market value of gas held on behalf of others was approximately $439.7 million. The Partnership held for storage approximately 3.6 million barrels (Mmbbls) of NGLs owed by third parties as of June 30, 2013, which had a market value of $125.6 million. As of December 31, 2012, the Partnership held for storage or under PAL agreements approximately 137.4 TBtu of gas and 4.2 Mmbbls of NGLs owned by third parties. Subsidiaries of the Partnership also periodically lend gas to customers under PAL and no-notice services. As of June 30, 2013, the amount of gas owed to the subsidiaries of the Partnership due to gas imbalances and gas loaned under PAL and no-notice services was approximately 16.8 TBtu. Assuming an average market price during June 2013 of $3.81 per MMBtu, the market value of that gas was approximately $64.0 million. As of June 30, 2013, the amount of NGLs owed to the operating subsidiaries due to imbalances was approximately 0.1 MMbbls, which had a market value of approximately $6.7 million. As of December 31, 2012, the amount of gas owed to the subsidiaries of the Partnership due to gas imbalances and gas loaned under PAL and no-notice services was approximately 11.7 TBtu and the amount of NGLs owed to the operating subsidiaries due to imbalances was approximately 0.1 MMbbls. If any significant customer should have credit or financial problems resulting in a delay or failure to repay the gas or NGLs owed to the operating subsidiaries, it could have a material adverse effect on the Partnership’s financial condition, results of operations or cash flows.

Note 4: Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables

Subsidiaries of the Partnership provide storage services whereby they store gas or NGLs on behalf of customers and also periodically hold customer gas under parking and lending (PAL) services. Since the customers retain title to the gas held by the Partnership in providing these services, the Partnership does not record the related gas on its balance sheet. The Partnership held for storage or under PAL agreements approximately 115.4 trillion British thermal units (TBtu) of gas owned by third parties as of June 30, 2013. Assuming an average market price during June 2013 of $3.81 per million British thermal units (MMBtu), the market value of gas held on behalf of others was approximately $439.7 million. The Partnership held for storage approximately 3.6 million barrels (Mmbbls) of NGLs owed by third parties as of June 30, 2013, which had a market value of $125.6 million. As of December 31, 2012, the Partnership held for storage or under PAL agreements approximately 137.4 TBtu of gas and 4.2 Mmbbls of NGLs owned by third parties.

Subsidiaries of the Partnership also periodically lend gas to customers under PAL and no-notice services. As of June 30, 2013, the amount of gas owed to the subsidiaries of the Partnership due to gas imbalances and gas loaned under PAL and no-notice services was approximately 16.8 TBtu. Assuming an average market price during June 2013 of $3.81 per MMBtu, the market value of that gas was approximately $64.0 million. As of June 30, 2013, the amount of NGLs owed to the operating subsidiaries due to imbalances was approximately 0.1 MMbbls, which had a market value of approximately $6.7 million. As of December 31, 2012, the amount of gas owed to the subsidiaries of the Partnership due to gas imbalances and gas loaned under PAL and no-notice services was approximately 11.7 TBtu and the amount of NGLs owed to the operating subsidiaries due to imbalances was approximately 0.1 MMbbls. If any significant customer should have credit or financial problems resulting in a delay or failure to repay the gas or NGLs owed to the operating subsidiaries, it could have a material adverse effect on the Partnership’s financial condition, results of operations or cash flows.