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Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Unrealized Gain On Derivative Contracts		$ 612	$ 785
Derivative contracts, at fair value (liability)		787	639
Investment Segment
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Collateral for derivative positions		1,906	872
Investment Segment | Not designated as hedging instrument | Other assets [Member]
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Asset derivatives, Gross		1,143	1,016
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(532)	(231)
Unrealized Gain On Derivative Contracts	[1]	611	785
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		1,317	853
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(532)	(231)
Derivative contracts, at fair value (liability)	[1]	785	622
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		68	4
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		1,317	852
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		$ 1,075	1,012
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 December 31, 2021 and 2020 was $1,906 million and $872 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the 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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