Condensed Consolidated Balance Sheet (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current Assets:
Cash	$ 127	$ 113
Receivables:
Affiliates	793	2,601
Advances to affiliate	466,802	526,380
Trade and other	110,692	148,172
Transportation and exchange gas receivables	4,251	6,757
Inventories	74,164	47,532
Regulatory assets	48,601	37,520
Other	21,144	13,451
Total current assets	726,574	782,526
Investments, at cost plus equity in undistributed earnings	48,686	50,262
Property, Plant and Equipment:
Natural gas transmission plant	9,090,021	8,867,626
Less-Accumulated depreciation and amortization	3,183,566	3,090,234
Total property, plant and equipment, net	5,906,455	5,777,392
Other Assets:
Regulatory assets	252,493	256,612
Other	65,075	57,785
Total other assets	317,568	314,397
Total Assets	6,999,283	6,924,577
Payables:
Affiliates	43,864	28,268
Trade and other	176,239	114,635
Transportation and exchange gas payables	1,503	3,599
Reserve for rate refunds	0	98,217
Accrued liabilities	138,109	153,263
Total current liabilities	359,715	397,982
Long-Term Debt	1,428,424	1,428,355
Other Long-Term Liabilities:
Asset retirement obligations	235,326	238,085
Regulatory liabilities	301,509	269,563
Other	12,758	5,307
Total other long-term liabilities	549,593	512,955
Contingent Liabilities and Commitments (Note 2)
Owner's Equity:
Member's capital	2,351,499	2,257,499
Retained earnings	2,310,313	2,328,044
Accumulated other comprehensive loss	(261)	(258)
Total owner's equity	4,661,551	4,585,285
Total liabilities and owner's equity	$ 6,999,283	$ 6,924,577