Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Derivatives Not Designated as Hedging Instruments, Fair Value
Unrealized Gain On Derivative Contracts		$ 24	$ 64
Derivative contracts, at fair value (liability)		$ 702	$ 979
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		$ 1,600	$ 1,700
Investment Segment | Not designated as hedging instrument
Derivatives Not Designated as Hedging Instruments, Fair Value
Derivative contracts, at fair value (liability)	[1]	693	979
Investment Segment | Not designated as hedging instrument | Other assets [Member]
Derivatives Not Designated as Hedging Instruments, Fair Value
Asset derivatives, Gross		71	64
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(57)	(25)
Unrealized Gain On Derivative Contracts	[1]	14	39
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities
Derivatives Not Designated as Hedging Instruments, Fair Value
Liability derivatives, Gross		750	1,004
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(57)	(25)
Investment Segment | Not designated as hedging instrument | Equity Contracts | Other assets [Member]
Derivatives Not Designated as Hedging Instruments, Fair Value
Asset derivatives, Gross		52	11
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	999
Investment Segment | Not designated as hedging instrument | Credit Contracts | Other assets [Member]
Derivatives Not Designated as Hedging Instruments, Fair Value
Asset derivatives, Gross		14	39
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		2	2
Investment Segment | Not designated as hedging instrument | Commodity Contracts | Other assets [Member]
Derivatives Not Designated as Hedging Instruments, Fair Value
Asset derivatives, Gross		5	14
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		$ 9	$ 3

[1] Excludes netting of cash collateral received and posted. The total collateral posted at March 31, 2024 and December 31, 2023 was $1.6 billion and $1.7 billion, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the condensed consolidated balance sheets.