Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Cash	$ 0	$ 0
Receivables:
Trade	223,864	242,416
Affiliates	1,011	669
Advances to affiliate	642,734	0
Other	14,660	10,850
Transportation and exchange gas receivables	4,627	6,360
Inventories:
Gas in storage, at original cost	926	857
Gas available for customer nomination, at average cost	7,909	20,653
Materials and supplies, at average cost	47,462	43,482
Regulatory assets	62,861	69,440
Other	13,847	11,240
Total current assets	1,019,901	405,967
Property, Plant and Equipment:
Natural gas transmission plant	17,123,779	16,764,904
Less-Accumulated depreciation and amortization	4,802,256	4,438,077
Total property, plant and equipment, net	12,321,523	12,326,827
Other Assets:
Regulatory assets	281,870	290,923
Right-of-use assets	78,899	84,979
Other	252,051	210,017
Total other assets	612,820	585,919
Total assets	13,954,244	13,318,713
Payables:
Trade	109,636	155,676
Affiliates	32,676	47,740
Advances from affiliate	0	252,549
Cash overdrafts	18,813	28,292
Transportation and exchange gas payables	1,905	3,961
Reserve for rate refunds	0	188,842
Accrued liabilities:
Property and other taxes	20,177	19,034
Interest	75,806	70,572
Regulatory liabilities	57,086	57,359
Customer deposits	24,686	30,551
Customer advances	27,082	27,207
Asset retirement obligations	52,764	32,704
Other	41,864	19,060
Long-term debt due within one year	22,640	20,180
Total current liabilities	485,135	953,727
Long-Term Debt	5,217,140	4,044,790
Other Long-Term Liabilities:
Asset retirement obligations	397,737	426,505
Regulatory liabilities	946,774	966,961
Advances for construction costs	38,585	16,533
Deferred revenue	205,030	215,598
Lease liability	78,688	84,528
Other	4,336	4,288
Total other long-term liabilities	1,671,150	1,714,413
Contingent Liabilities and Commitments (Note 4)
Member's Equity:
Member's capital	4,543,499	4,428,499
Retained earnings	2,037,320	2,177,284
Total member's equity	6,580,819	6,605,783
Total liabilities and member's equity	$ 13,954,244	$ 13,318,713