v3.26.3
Fair Value - Schedule of Quantitative Information (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2026
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 $ 46
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 $ (7)
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 1.31
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 2.9
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 2.21
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 1.82
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 6.56
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 4.42
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 $ 45
Equity investments, time to liquidity event 1 year 3 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 $ 560
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 $ 282
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 2031
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 20
Investment, Type [Extensible Enumeration] Equity Funds [Member]
Discounted Cash Flows [Member] | Market 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 2.93
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 6.36
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 4.6
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 $ 12
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 $ 104
Investment, Type [Extensible Enumeration] Equity Funds [Member]