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Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivatives Not Designated as Hedging Instruments, Fair Value    
Asset derivatives, Gross $ 7 $ 7
Liability derivatives, Gross 95  
Unrealized Gain On Derivative Contracts 17 7
Derivative contracts, at fair value (liability) $ 735 $ 595
Derivative Liability, Statement of Financial Position [Extensible Enumeration] [1] Accrued Liabilities Accrued Liabilities
Commodity contracts    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Asset derivatives, Gross $ 34 $ 10
Liability derivatives, Gross 184 3
Investment Segment    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Collateral for derivative positions 1,000 1,000
Investment Segment | Not designated as hedging instrument    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Derivative contracts, at fair value (liability) [1] 640 595
Investment Segment | Not designated as hedging instrument | Other assets    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Asset derivatives, Gross 192 154
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] (182) (154)
Unrealized Gain On Derivative Contracts [1] 10  
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Liability derivatives, Gross 822 749
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] (182) (154)
Investment Segment | Not designated as hedging instrument | Equity contracts | Other assets    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Asset derivatives, Gross 192 153
Investment Segment | Not designated as hedging instrument | Equity contracts | Accrued expenses and other liabilities    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Liability derivatives, Gross 636 739
Investment Segment | Not designated as hedging instrument | Commodity contracts | Other assets    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Asset derivatives, Gross   1
Investment Segment | Not designated as hedging instrument | Commodity contracts | Accrued expenses and other liabilities    
Derivatives Not Designated as Hedging Instruments, Fair Value    
Liability derivatives, Gross $ 186 $ 10
[1] Excludes netting of cash collateral received and posted. The total collateral posted at March 31, 2026 and December 31, 2025 was $1.0 billion and $1.0 billion, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the condensed consolidated balance sheets.