Balance Sheet (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash	$ 0	$ 0
Receivables:
Other	10,367	10,572
Transportation and exchange gas receivables	4,316	2,803
Inventories:
Materials and supplies, at average cost	44,959	42,904
Gas in storage, last-in, first-out	3,120	0
Gas available for customer nomination, at average cost	30,639	39,832
Gas in storage, at original cost	788	752
Regulatory assets	84,375	87,198
Other	18,681	11,835
Total current assets	1,627,497	1,809,141
Property, plant and equipment	19,466,256	19,293,599
Less-Accumulated depreciation and amortization	5,993,128	5,963,213
Total property, plant and equipment, net	13,473,128	13,330,386
Other Assets:
Regulatory assets	289,737	299,099
Right-of-use assets	51,611	53,255
Other	309,107	296,408
Total other assets	650,455	648,762
Total assets	15,751,080	15,788,289
Payables:
Trade	233,977	263,363
Cash overdrafts	8,146	15,374
Transportation and exchange gas payables	4,234	6,433
Accrued liabilities:
Interest	50,023	76,000
Asset retirement obligations	104,912	95,540
Regulatory liabilities	54,927	49,259
Taxes, other than income taxes	29,469	28,738
Customer deposits	32,975	35,046
Customer advances	19,767	17,183
Other	21,679	26,795
Long-term debt due within one year	32,433	31,718
Total current liabilities	642,423	700,266
Long-Term Debt	5,223,362	5,229,450
Other Long-Term Liabilities:
Regulatory liabilities	964,028	955,628
Asset retirement obligations	518,524	523,741
Contract liabilities	170,691	173,332
Lease liability	54,733	56,353
Other	11,885	11,920
Total other long-term liabilities	1,719,861	1,720,974
Contingent Liabilities and Commitments (Note 3)
Member’s Equity:
Member’s capital	5,088,499	5,088,499
Retained earnings	3,076,935	3,049,100
Total member’s equity	8,165,434	8,137,599
Total liabilities and member’s equity	15,751,080	15,788,289
Related Party [Member]
Receivables:
Advances to affiliate	1,180,594	1,352,927
Trade	11,634	9,559
Affiliates	11,634	9,559
Payables:
Affiliates	49,881	54,817
Nonrelated Party [Member]
Receivables:
Trade	238,024	250,759
Affiliates	$ 238,024	$ 250,759