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Statement of Cash Flows (Unaudited) - Transco - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
OPERATING ACTIVITIES:    
Net income (loss) $ 1,788 $ 1,312
Adjustments to reconcile to net cash provided (used) by operating activities:    
Depreciation, depletion, and amortization 1,176 1,190
Cash provided (used) by changes in current assets and liabilities:    
Inventories (32) (61)
Other current assets and deferred charges (23) (36)
Other current liabilities (58) 150
Other, including changes in noncurrent assets and liabilities (115) (77)
Net cash provided (used) by operating activities 2,979 2,883
FINANCING ACTIVITIES:    
Proceeds from other financing obligations 2,790 2,994
Payments on other financing obligations (1,119) (975)
Payments for debt issuance costs (33) (26)
Net cash provided (used) by financing activities (49) 154
INVESTING ACTIVITIES:    
Capital expenditures (1) (3,193) (1,984)
Net cash provided (used) by investing activities (2,790) (2,194)
Increase (decrease) in cash and cash equivalents 140 843
Cash and cash equivalents at beginning of year 63 60
Cash and cash equivalents at end of period 203 903
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]    
(1) Increases to property, plant, and equipment, exclusive of equity AFUDC (3,347) (2,041)
Capital expenditures (3,193) (1,984)
Transcontinental Gas Pipe Line Company, LLC [Member]    
OPERATING ACTIVITIES:    
Net income (loss) 751 635
Adjustments to reconcile to net cash provided (used) by operating activities:    
Depreciation, depletion, and amortization 290 315
Allowance for equity funds used during construction (equity AFUDC) (23) (12)
Cash provided (used) by changes in current assets and liabilities:    
Affiliate receivables (3) 17
Trade and other accounts receivable 27 (29)
Inventories (15) (3)
Regulatory assets (20) (50)
Other current assets and deferred charges (8) (3)
Trade accounts payable (22) (17)
Affiliate payables (14) (13)
Reserve for rate refunds (Note 9) (179) 86
Other current liabilities 88 75
Other, including changes in noncurrent assets and liabilities (19) (14)
Net cash provided (used) by operating activities 853 987
FINANCING ACTIVITIES:    
Payments for debt issuance costs (1) 0
Cash distributions to parent (696) (606)
Cash contributions from parent 275 0
Net cash provided (used) by financing activities (419) (621)
INVESTING ACTIVITIES:    
Capital expenditures (1) (524) (405)
Contributions and advances for construction costs 31 16
Dispositions – net (50) (47)
Advances to affiliate – net 54 83
Purchase of asset retirement obligations trust investments (19) (27)
Proceeds from sale of asset retirement obligations trust investments 74 14
Net cash provided (used) by investing activities (434) (366)
Increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of year 0 0
Cash and cash equivalents at end of period 0 0
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]    
(1) Increases to property, plant, and equipment, exclusive of equity AFUDC (591) (390)
Changes in related accounts payable and accrued liabilities 67 (15)
Capital expenditures (524) (405)
Transcontinental Gas Pipe Line Company, LLC [Member] | Other Financing Obligations    
FINANCING ACTIVITIES:    
Proceeds from other financing obligations 22 2
Payments on other financing obligations $ (19) $ (17)