Related Party Balances (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Southern Union	Dec. 31, 2012 Successor		Dec. 31, 2012 Successor Southern Union	Dec. 31, 2012 Successor Other accounts payable		Dec. 31, 2012 Successor Other accounts payable Southern Union		Dec. 31, 2012 Successor Income Taxes Southern Union		Dec. 31, 2011 Predecessor		Dec. 31, 2011 Predecessor Southern Union	Dec. 31, 2011 Predecessor Other accounts payable		Dec. 31, 2011 Predecessor Other accounts payable Southern Union		Dec. 31, 2011 Predecessor Income Taxes Southern Union
Related Party Transaction
Note receivable - related party, current		$ 0		$ 0							$ 342		$ 342
Notes receivable - related party, noncurrent		831		831							688		688
Notes Receivable - related party		831									1,030
Accounts receivable — related parties (1)		14	[1]								6	[1]
Accounts payable — related parties:		27			1	[2]	26	[3]	0	[4]	52			0	[2]	19	[3]	33	[4]
Insurance Proceeds - related party	$ 2

[1] Accounts receivable from related companies reflected above primarily related to services provided for ETE, ETP, Citrus, MGE and other affiliates. The December 31, 2011 balance also included interest income associated with a note receivable from an affiliate, which was repaid on March 26, 2012.

[2] Accounts payable from related companies reflected above primarily related to various administrative and operating costs paid by other affiliate companies on behalf of the Company.

[3] Accounts payable from related companies reflected above primarily related to payroll funding including merger-related expenses, provided by Southern Union. The December 31, 2011 amount was net of insurance proceeds of $2 million owed by Southern Union to the Company.

[4] Accounts payable from related companies reflected above related to income taxes payable to Southern Union per the tax sharing agreement to provide for taxes to be remitted upon the filing of the tax return.