Statement of Cash Flows (Unaudited) - Transco - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 729	$ 662
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, depletion, and amortization	585	548
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Inventories	28	34
Increase (Decrease) in Other Current Assets	(40)	9
Other current liabilities	(70)	(218)
Other Operating Activities, Cash Flow Statement	(29)	(61)
Net cash provided (used) by operating activities	1,433	1,234
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net cash provided (used) by financing activities	(223)	(281)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures (1)	(1,012)	(544)
Net cash provided (used) by investing activities	(1,170)	(2,436)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	40	(1,483)
Cash and cash equivalents at beginning of year	60	2,150
Cash and cash equivalents at end of period	100	667
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Property, Plant and Equipment, Additions	(978)	(509)
Capital expenditures	(1,012)	(544)
Transcontinental Gas Pipe Line Company, LLC [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	321	348
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, depletion, and amortization	149	134
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(7)	(19)
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable, Related Parties	15	(2)
Increase (Decrease) in Accounts and Other Receivables	(17)	13
Increase (Decrease) in Inventories	(9)	4
Increase (Decrease) in Other Regulatory Assets	(48)	3
Increase (Decrease) in Other Current Assets	2	(8)
Increase (Decrease) in Accounts Payable, Trade	(26)	(37)
Increase (Decrease) in Accounts Payable, Related Parties	(4)	(5)
Other current liabilities	42	(20)
Other Operating Activities, Cash Flow Statement	(6)	(15)
Net cash provided (used) by operating activities	412	396
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Issuance of Other Long-Term Debt	2	2
Repayments of Other Long-Term Debt	(8)	(8)
Cash distributions to parent	(246)	(320)
Net cash provided (used) by financing activities	(252)	(326)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures (1)	(221)	(232)
Contributions in aid of construction	7	2
Payments for (Proceeds from) Removal Costs	(13)	(11)
IncreaseDecreaseInAdvancesToAffiliates	71	172
Payments to Acquire Investments to be Held in Decommissioning Trust Fund	(10)	(6)
Proceeds from Decommissioning Trust Fund Assets	6	5
Net cash provided (used) by investing activities	(160)	(70)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	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]
Property, Plant and Equipment, Additions	(170)	(233)
Increase (Decrease) in Accounts Payable And Accrued Liabilities Related To Capital Expenditures	(51)	1
Capital expenditures	$ (221)	$ (232)

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