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Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Unrealized Gain On Derivative Contracts		$ 469	$ 612
Derivative contracts, at fair value (liability)		729	787
Investment Segment
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Collateral for derivative positions		1,615	1,906
Investment Segment | Not designated as hedging instrument | Other assets [Member]
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Asset derivatives, Gross		910	1,143
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(454)	(532)
Unrealized Gain On Derivative Contracts	[1]	456	611
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Liability derivatives, Gross		1,183	1,317
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(454)	(532)
Derivative contracts, at fair value (liability)	[1]	729	785
Investment Segment | Not designated as hedging instrument | Equity Contract [Member] | Other assets [Member]
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Asset derivatives, Gross		82	68
Investment Segment | Not designated as hedging instrument | Equity Contract [Member] | Accrued expenses and other liabilities
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Liability derivatives, Gross		1,182	1,317
Investment Segment | Not designated as hedging instrument | Credit Risk Contract [Member] | Other assets [Member]
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Asset derivatives, Gross		828	$ 1,075
Investment Segment | Not designated as hedging instrument | Credit Risk Contract [Member] | Accrued expenses and other liabilities
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Liability derivatives, Gross		$ 1
[1] Excludes netting of cash collateral received and posted. The total collateral posted at March 31, 2022 and December 31, 2021 was $1,615 million and $1,906 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the condensed consolidated balance sheets.

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Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

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Unrealized Gain On Derivative Contracts.

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement.

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