Hedging Activities and Fair Value Measurements - Schedule of Hedging Instruments Under the FASB's Derivative and Hedging Guidance (Details)	6 Months Ended
	Jun. 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	13.8
Derivatives designated as hedging instruments | Forecasted sales of natural gas (Bcf) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	34.4
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	14.7
Derivatives designated as hedging instruments | Forecasted sales of NGLs (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	5.8
Derivatives designated as hedging instruments | Forecasted sales of octane enhancement products (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	5.3
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	0.9
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	1.2
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	203.2
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	22.7
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	202.6
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	31.7
Derivatives designated as hedging instruments | Forecasted purchases of refined products (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	2.7
Derivatives designated as hedging instruments | Forecasted sales of refined products (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	3.5
Derivatives designated as hedging instruments | Forecasted purchases of crude oil (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	20.7
Derivatives designated as hedging instruments | Forecasted purchases of crude oil (MMBbls) | Cash flow hedge | Long-Term
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	6.5
Derivatives designated as hedging instruments | Forecasted sales of crude oil (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	26.4
Derivatives designated as hedging instruments | Forecasted sales of crude oil (MMBbls) | Cash flow hedge | Long-Term
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	12.9
Derivatives designated as hedging instruments | Forecasted purchases of petrochemical products (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	0.1
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	0.5
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	0.3
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	32.7
Derivatives not designated as hedging instruments | NGL risk management activities (MMBbls) | Mark-to-market | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	38.4
Derivatives not designated as hedging instruments | NGL risk management activities (MMBbls) | Mark-to-market | Long-Term
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	14.3
Derivatives not designated as hedging instruments | Refined products risk management activities (MMBbls) | Mark-to-market | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	3.7
Derivatives not designated as hedging instruments | Crude oil risk management activities (MMBbls) | Mark-to-market | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	31.9
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