Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions		Dec. 31, 2025	Dec. 31, 2024
Derivatives Not Designated as Hedging Instruments, Fair Value
Unrealized Gain On Derivative Contracts		$ 7	$ 22
Derivative contracts, at fair value (liability)		$ 595	$ 756
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	[1]	Accrued Liabilities	Accrued Liabilities
Investment Segment
Derivatives Not Designated as Hedging Instruments, Fair Value
Collateral for derivative positions		$ 1,000	$ 1,500
Investment Segment | Not designated as hedging instrument
Derivatives Not Designated as Hedging Instruments, Fair Value
Derivative contracts, at fair value (liability)	[1]	595	756
Investment Segment | Not designated as hedging instrument | Other assets
Derivatives Not Designated as Hedging Instruments, Fair Value
Asset derivatives, Gross		154	121
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(154)	(103)
Unrealized Gain On Derivative Contracts	[1]		18
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities
Derivatives Not Designated as Hedging Instruments, Fair Value
Liability derivatives, Gross		749	859
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(154)	(103)
Investment Segment | Not designated as hedging instrument | Equity contracts | Other assets
Derivatives Not Designated as Hedging Instruments, Fair Value
Asset derivatives, Gross		153	81
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		739	853
Investment Segment | Not designated as hedging instrument | Credit contracts | Other assets
Derivatives Not Designated as Hedging Instruments, Fair Value
Asset derivatives, Gross			18
Investment Segment | Not designated as hedging instrument | Credit contracts | Accrued expenses and other liabilities
Derivatives Not Designated as Hedging Instruments, Fair Value
Liability derivatives, Gross			6
Investment Segment | Not designated as hedging instrument | Commodity contracts | Other assets
Derivatives Not Designated as Hedging Instruments, Fair Value
Asset derivatives, Gross		1	$ 22
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		$ 10

[1] Excludes netting of cash collateral received and posted. The total collateral posted at December 31, 2025 and 2024 was $1.0 billion and $1.5 billion, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the consolidated balance sheets.