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Statement of Changes in Member's Equity (Unaudited) - Transco - USD ($)
$ in Millions
Total
Transcontinental Gas Pipe Line Company, LLC [Member]
Member's Capital
Transcontinental Gas Pipe Line Company, LLC [Member]
Retained Earnings
Transcontinental Gas Pipe Line Company, LLC [Member]
Balance at beginning of period at Dec. 31, 2024     $ 5,088 $ 3,217
Cash contributions from parent   $ 0 0  
Net income $ 1,237     635
Cash distributions to parent   606   (606)
Balance at end of period at Jun. 30, 2025   8,334 5,088 3,246
Balance at beginning of period at Mar. 31, 2025     5,088 3,292
Cash contributions from parent     0  
Net income 546     314
Cash distributions to parent       (360)
Balance at end of period at Jun. 30, 2025   8,334 5,088 3,246
Balance at beginning of period at Dec. 31, 2025   8,391 5,088 3,303
Cash contributions from parent   (275) 275  
Net income 1,692     751
Cash distributions to parent   696   (696)
Balance at end of period at Jun. 30, 2026   8,721 5,363 3,358
Balance at beginning of period at Mar. 31, 2026     5,363 3,349
Cash contributions from parent     0  
Net income $ 827     367
Cash distributions to parent       (358)
Balance at end of period at Jun. 30, 2026   $ 8,721 $ 5,363 $ 3,358