Acquisitions, Divestitures and Deconsolidations - Boardwalk Pipelines (Details) $ in Millions	Sep. 29, 2023 USD ($) pipeline	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Assets		$ 79,197	$ 75,567
Liabilities		62,672	60,366
Property, plant and equipment		$ 10,718	$ 10,027
Williams Olefins Pipeline Holdco LLC (“Bayou Ethane”)
Business Acquisition [Line Items]
Number of pipelines | pipeline	2
Boardwalk Pipelines
Business Acquisition [Line Items]
Assets	$ 382
Liabilities	27
Property, plant and equipment	296
Intangible assets recognized	$ 34
Boardwalk Pipelines | Williams Olefins Pipeline Holdco LLC (“Bayou Ethane”)
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Payments to acquire businesses	$ 355