v3.26.3
Hedging Activities and Fair Value Measurements - Schedule of Hedging Instruments Under the FASB's Derivative and Hedging Guidance (Details)
 9 Months Ended
Sep. 30, 2026
TWh
MMBbls
Bcf
Derivatives designated as hedging instruments | Forecasted natural gas purchases for plant thermal reduction (Bcf) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume | Bcf 11.6
Derivatives designated as hedging instruments | Forecasted natural gas purchases for plant thermal reduction (Bcf) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume | Bcf 1.6
Derivatives designated as hedging instruments | Forecasted sales of natural gas (Bcf) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume | Bcf 33.7
Derivatives designated as hedging instruments | Forecasted sales of natural gas (Bcf) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume | Bcf 25.3
Derivatives designated as hedging instruments | Forecasted sales of NGLs (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 5.1
Derivatives designated as hedging instruments | Forecasted sales of NGLs (MMBbls) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 0.7
Derivatives designated as hedging instruments | Forecasted sales of octane enhancement products (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 4.5
Derivatives designated as hedging instruments | Forecasted sales of octane enhancement products (MMBbls) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 0.6
Derivatives designated as hedging instruments | Natural gas storage inventory management activities (Bcf) | Fair value hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume | Bcf 0.5
Derivatives designated as hedging instruments | Forecasted purchases of NGLs and related hydrocarbon products (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 233.8
Derivatives designated as hedging instruments | Forecasted purchases of NGLs and related hydrocarbon products (MMBbls) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 19.9
Derivatives designated as hedging instruments | Forecasted sales of NGLs and related hydrocarbon products (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 229.1
Derivatives designated as hedging instruments | Forecasted sales of NGLs and related hydrocarbon products (MMBbls) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 37.6
Derivatives designated as hedging instruments | Forecasted purchases of refined products (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 2.0
Derivatives designated as hedging instruments | Forecasted sales of refined products (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 2.7
Derivatives designated as hedging instruments | Forecasted purchases of crude oil (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 23.2
Derivatives designated as hedging instruments | Forecasted purchases of crude oil (MMBbls) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 6.6
Derivatives designated as hedging instruments | Forecasted sales of crude oil (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 29.0
Derivatives designated as hedging instruments | Forecasted sales of crude oil (MMBbls) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 13.1
Derivatives designated as hedging instruments | Forecasted sales of petrochemical products (MMBbls) | Cash flow hedge | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 0.1
Derivatives designated as hedging instruments | Forecasted purchases of power related to asset operations (terawatt hours (“TWh”)) | Cash flow hedge | Current  
Derivative [Line Items]  
Volume | TWh 0.3
Derivatives designated as hedging instruments | Forecasted purchases of power related to asset operations (terawatt hours (“TWh”)) | Cash flow hedge | Long-Term  
Derivative [Line Items]  
Volume | TWh 0.1
Derivatives not designated as hedging instruments | Natural gas risk management activities (Bcf) | Mark-to-market | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume | Bcf 40.3
Derivatives not designated as hedging instruments | Natural gas risk management activities (Bcf) | Mark-to-market | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume | Bcf 9.5
Derivatives not designated as hedging instruments | NGL risk management activities (MMBbls) | Mark-to-market | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 31.8
Derivatives not designated as hedging instruments | NGL risk management activities (MMBbls) | Mark-to-market | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 7.3
Derivatives not designated as hedging instruments | Refined products risk management activities (MMBbls) | Mark-to-market | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 1.6
Derivatives not designated as hedging instruments | Crude oil risk management activities (MMBbls) | Mark-to-market | Current  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 22.8
Derivatives not designated as hedging instruments | Crude oil risk management activities (MMBbls) | Mark-to-market | Long-Term  
Derivative [Line Items]  
Derivative, nonmonetary notional amount, volume 7.6
Derivatives not designated as hedging instruments | Commercial energy risk management activities (TWh) | Mark-to-market | Current  
Derivative [Line Items]  
Volume | TWh 0.5
Derivatives not designated as hedging instruments | Commercial energy risk management activities (TWh) | Mark-to-market | Long-Term  
Derivative [Line Items]  
Volume | TWh 0.8