Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 39	$ 38	$ 34
Variable Lease, Cost	31	31	26
Sublease Income	0	(1)	0
Lease, Cost	70	68	60
Operating Lease, Payments	37	37	33
Operating Lease, Right-of-Use Asset	$ 154	$ 159
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Operating Lease, Liability, Current	$ 26	$ 24
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Operating Lease, Liability, Noncurrent	$ 142	$ 148
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities and Deferred Revenue, Noncurrent	Other Liabilities and Deferred Revenue, Noncurrent
Operating Lease, Weighted Average Remaining Lease Term	11 years	11 years
Operating Lease, Weighted Average Discount Rate, Percent	4.90%	4.78%
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 34
Lessee, Operating Lease, Liability, Payments, Due Year Two	33
Lessee, Operating Lease, Liability, Payments, Due Year Three	30
Lessee, Operating Lease, Liability, Payments, Due Year Four	22
Lessee, Operating Lease, Liability, Payments, Due Year Five	19
Lessee, Operating Lease, Liability, Payments, Due after Year Five	86
Lessee, Operating Lease, Liability, Payments, Due	224
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ 56
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities
Operating Lease, Liability	$ 168
Transcontinental Gas Pipe Line Company, LLC [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	9	$ 9	9
Variable Lease, Cost	7	7	7
Lease, Cost	16	16	16
Operating Lease, Payments	9	10	10
Operating Lease, Right-of-Use Asset	$ 48	$ 53
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Operating Lease, Liability, Current	$ 6	$ 6
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Operating Lease, Liability, Noncurrent	$ 51	$ 56
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Operating Lease, Weighted Average Remaining Lease Term	13 years	13 years
Operating Lease, Weighted Average Discount Rate, Percent	4.77%	4.73%
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 9
Lessee, Operating Lease, Liability, Payments, Due Year Two	9
Lessee, Operating Lease, Liability, Payments, Due Year Three	10
Lessee, Operating Lease, Liability, Payments, Due Year Four	10
Lessee, Operating Lease, Liability, Payments, Due Year Five	10
Lessee, Operating Lease, Liability, Payments, Due after Year Five	32
Lessee, Operating Lease, Liability, Payments, Due	80
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ 23
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities
Operating Lease, Liability	$ 57
Northwest Pipeline LLC [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	3	$ 1	1
Variable Lease, Cost	1	1	1
Lease, Cost	4	2	2
Operating Lease, Payments	2	1	$ 1
Operating Lease, Right-of-Use Asset	$ 5	$ 9
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Operating Lease, Liability, Current	$ 1	$ 1
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Operating Lease, Liability, Noncurrent	$ 5	$ 7
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Operating Lease, Weighted Average Remaining Lease Term	19 years	15 years
Operating Lease, Weighted Average Discount Rate, Percent	4.90%	4.18%
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 1
Lessee, Operating Lease, Liability, Payments, Due Year Two	0
Lessee, Operating Lease, Liability, Payments, Due Year Three	1
Lessee, Operating Lease, Liability, Payments, Due Year Four	0
Lessee, Operating Lease, Liability, Payments, Due Year Five	1
Lessee, Operating Lease, Liability, Payments, Due after Year Five	6
Lessee, Operating Lease, Liability, Payments, Due	9
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ 3
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities
Operating Lease, Liability	$ 6