Regulatory Assets and Liabilities - Williams (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Regulatory Liability [Line Items]
Total regulatory assets	$ 666	$ 622
Regulatory Liability, Current	85	77
Total regulatory liabilities	1,385	1,365
Other current assets and deferred charges [Member]
Regulatory Liability [Line Items]
Regulatory Assets, Current	84	95
Regulatory assets, deferred charges, and other [Member]
Regulatory Liability [Line Items]
Regulatory Assets, Noncurrent	582	527
Other Current Liabilities
Regulatory Liability [Line Items]
Regulatory Liability, Current	85	77
Regulatory liabilities, deferred income, and other [Member]
Regulatory Liability [Line Items]
Regulatory Liabilities, Noncurrent	$ 1,300	$ 1,288