Revenue from Contracts with Customers - Performance Obligations (Details) $ in Billions	Sep. 30, 2025 USD ($)
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 19.8
Boardwalk Pipelines
Disaggregation of Revenue [Line Items]
Remaining performance obligations	5.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 0.9
Expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 2.8
Expected timing of satisfaction	1 year