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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, 2023     $ 5,088 $ 3,049
Net income $ 1,739 $ 996   996
Cash distributions to parent   830   (830)
Balance at end of period at Sep. 30, 2024   8,303 5,088 3,215
Balance at beginning of period at Jun. 30, 2024     5,088 3,076
Net income 706 319   319
Cash distributions to parent       (180)
Balance at end of period at Sep. 30, 2024   8,303 5,088 3,215
Balance at beginning of period at Dec. 31, 2024   8,305 5,088 3,217
Net income 1,884 1,045   1,045
Cash distributions to parent   907   (907)
Balance at end of period at Sep. 30, 2025   8,443 5,088 3,355
Balance at beginning of period at Jun. 30, 2025     5,088 3,246
Net income $ 647 410   410
Cash distributions to parent       (301)
Balance at end of period at Sep. 30, 2025   $ 8,443 $ 5,088 $ 3,355