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Revenue Recognition Contract Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Contract With Customer, Liability [Line Items] |  |  |  |
Contract with Customer, Liability - Beginning of Period | $ 1,054 | $ 1,064 | $ 1,046 | $ 1,081
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress | 32 | 33 | 152 | 150
Contract with Customer, Liability, Increase (Decrease) for Contract from Asset Purchase |  |  | 23 | 0
Other Significant Noncash Transaction, Value of Consideration Received | 1 | 2 | 5 | 6
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination | 0 | 53 | 0 | 53
Contract with Customer, Liability, Revenue Recognized | (83) | (66) | (222) | (204)
Contract with Customer, Liability - End of Period | 1,004 | 1,086 | 1,004 | 1,086
Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |  |
Contract With Customer, Liability [Line Items] |  |  |  |
Contract with Customer, Liability - Beginning of Period | 168 | 179 | 173 | 184
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress | 0 | 0 | 0 | 0
Contract with Customer, Liability, Increase (Decrease) for Contract from Asset Purchase |  |  | 0 | 0
Other Significant Noncash Transaction, Value of Consideration Received | 0 | 0 | 0 | 0
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination | 0 | 0 | 0 | 0
Contract with Customer, Liability, Revenue Recognized | (3) | (3) | (8) | (8)
Contract with Customer, Liability - End of Period | 165 | 176 | 165 | 176
Northwest Pipeline LLC [Member] |  |  |  |
Contract With Customer, Liability [Line Items] |  |  |  |
Contract with Customer, Liability - Beginning of Period | 0 | 1 | 0 | 2
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress | 0 | 0 | 0 | 0
Contract with Customer, Liability, Increase (Decrease) for Contract from Asset Purchase |  |  | 0 | 0
Other Significant Noncash Transaction, Value of Consideration Received | 0 | 0 | 0 | 0
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination | 0 | 0 | 0 | 0
Contract with Customer, Liability, Revenue Recognized | 0 | 0 | 0 | (1)
Contract with Customer, Liability - End of Period | $ 0 | $ 1 | $ 0 | $ 1

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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- Definition The value of the noncash (or part noncash) consideration received in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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