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Fair Value - Schedule of Quantitative Information (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
MMBTU
$ / MMBTU
Fair Value, Recurring [Member] | Level 3 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments $ 49
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Fair Value, Recurring [Member] | Natural Gas Exchange Agreements [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Derivative Liability $ (14)
Internally Derived Weighted Average Cost Of Gas [Member] | Purchase [Member] | Minimum [Member] | Natural Gas Exchange Agreements [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Derivative, Forward Price | $ / MMBTU 1.65
Transaction/Delivery Volumes | MMBTU 270,000
Internally Derived Weighted Average Cost Of Gas [Member] | Purchase [Member] | Maximum [Member] | Natural Gas Exchange Agreements [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Derivative, Forward Price | $ / MMBTU 3.3
Transaction/Delivery Volumes | MMBTU 310,000
Internally Derived Weighted Average Cost Of Gas [Member] | Purchase [Member] | Weighted Average [Member] | Natural Gas Exchange Agreements [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Derivative, Forward Price | $ / MMBTU 2.65
Internally Derived Weighted Average Cost Of Gas [Member] | Sales [Member] | Minimum [Member] | Natural Gas Exchange Agreements [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Derivative, Forward Price | $ / MMBTU 2.04
Transaction/Delivery Volumes | MMBTU 75,000
Internally Derived Weighted Average Cost Of Gas [Member] | Sales [Member] | Maximum [Member] | Natural Gas Exchange Agreements [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Derivative, Forward Price | $ / MMBTU 8.41
Transaction/Delivery Volumes | MMBTU 310,000
Internally Derived Weighted Average Cost Of Gas [Member] | Sales [Member] | Weighted Average [Member] | Natural Gas Exchange Agreements [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Derivative, Forward Price | $ / MMBTU 5.61
Market Approach [Member] | Minimum [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, comparable enterprise values $ 130
Equity investments, time to liquidity event 9 months
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Market Approach [Member] | Maximum [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, comparable enterprise values $ 389
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Market Approach [Member] | Weighted Average [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, comparable enterprise values $ 246
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, terminal date 2030
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Discount Rate [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, measurement input 25
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Market Multiple Exit Reduction [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, measurement input 50
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Revenue Market Multiples [Member] | Minimum [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, measurement input 1.17
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Revenue Market Multiples [Member] | Maximum [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, measurement input 9.69
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Revenue Market Multiples [Member] | Weighted Average [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, measurement input 2.22
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Annual Revenues [Member] | Minimum [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, annual revenues $ 10
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Annual Revenues [Member] | Maximum [Member] | Fair Value, Recurring [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]  
Equity investments, annual revenues $ 166
Investment, Type [Extensible Enumeration] Equity Funds [Member]