Condensed Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current Assets:
Cash	$ 0	$ 0
Receivables:
Affiliates	326	489
Advances to affiliate	299,059	811,693
Trade and other	146,471	144,315
Transportation and exchange gas receivables	944	1,827
Inventories	47,685	55,209
Regulatory assets	90,367	87,059
Other	14,179	13,305
Total current assets	599,031	1,113,897
Investments, at cost plus equity in undistributed earnings	39,571	42,403
Property, Plant and Equipment:
Natural gas transmission plant	13,136,224	11,996,454
Less-Accumulated depreciation and amortization	3,833,689	3,687,473
Total property, plant and equipment, net	9,302,535	8,308,981
Other Assets:
Regulatory assets	269,000	264,001
Other	132,052	102,198
Total other assets	401,052	366,199
Total Assets	10,342,189	9,831,480
Payables:
Affiliates	23,483	29,455
Trade and other	305,949	251,872
Transportation and exchange gas payables	3,555	1,571
Accrued liabilities	160,087	197,697
Long-term debt due within one year	251,320	0
Total current liabilities	744,394	480,595
Long-Term Debt	2,197,717	2,210,754
Other Long-Term Liabilities:
Asset retirement obligations	271,211	248,518
Regulatory liabilities	501,201	449,391
Advances for construction costs	261,487	283,028
Transportation prepayments	11,115	11,837
Deferred Revenue	228,258	0
Other	4,573	6,088
Total other long-term liabilities	1,277,845	998,862
Contingent Liabilities and Commitments (Note 2)
Owner's Equity:
Member's capital	3,788,499	3,678,499
Retained earnings	2,333,616	2,462,760
Accumulated other comprehensive income	118	10
Total owner's equity	6,122,233	6,141,269
Total liabilities and owner's equity	$ 10,342,189	$ 9,831,480