Hedging Activities and Fair Value Measurements - Schedule of Hedging Instruments Under the FASB's Derivative and Hedging Guidance (Details)	9 Months Ended
	Sep. 30, 2025 TWh MMBbls Bcf
Derivatives designated as hedging instruments: | Forecasted sales of natural gas (Bcf) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	30.0
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	22.7
Derivatives designated as hedging instruments: | Forecasted sales of NGLs (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	2.7
Derivatives designated as hedging instruments: | Forecasted sales of NGLs (MMBbls) | Cash flow hedge | Long-Term
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	0.2
Derivatives designated as hedging instruments: | Forecasted sales of octane enhancement products (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	1.9
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	0.4
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	1.1
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	217.0
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	23.9
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	217.9
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	29.2
Derivatives designated as hedging instruments: | Forecasted purchases of refined products (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	0.6
Derivatives designated as hedging instruments: | Forecasted sales of refined products (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	1.8
Derivatives designated as hedging instruments: | Forecasted sales of refined products (MMBbls) | Cash flow hedge | Long-Term
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	0.1
Derivatives designated as hedging instruments: | Forecasted purchases of crude oil (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	15.3
Derivatives designated as hedging instruments: | Forecasted purchases of crude oil (MMBbls) | Cash flow hedge | Long-Term
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	8.1
Derivatives designated as hedging instruments: | Forecasted sales of crude oil (MMBbls) | Cash flow hedge | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	25.2
Derivatives designated as hedging instruments: | Forecasted sales of crude oil (MMBbls) | Cash flow hedge | Long-Term
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	16.0
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	1.2
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	0.5
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	48.3
Derivatives not designated as hedging instruments: | NGL risk management activities (MMBbls) | Mark-to-market | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	36.4
Derivatives not designated as hedging instruments: | NGL risk management activities (MMBbls) | Mark-to-market | Long-Term
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	6.0
Derivatives not designated as hedging instruments: | Refined products risk management activities (MMBbls) | Mark-to-market | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	7.2
Derivatives not designated as hedging instruments: | Crude oil risk management activities (MMBbls) | Mark-to-market | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	50.3
Derivatives not designated as hedging instruments: | Petrochemical risk management activities (MMBbls) | Mark-to-market | Current
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume	0.3