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Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Derivative contracts at fair value		$ 754	$ 639
Derivative Asset		683	785
Investment Segment
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Collateral for derivative positions		995	872
Investment Segment | Not designated as hedging instrument | Other assets.
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Netting across contract types	[1]	(357)	(231)
Derivative contracts, at fair value	[1]	679	785
Derivative Asset		1,036	1,016
Investment Segment | Not designated as hedging instrument | Other assets. | Equity contracts
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Derivative Asset		13	4
Investment Segment | Not designated as hedging instrument | Other assets. | Credit contracts
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Derivative Asset		1,023	1,012
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		1,085	853
Netting across contract types	[1]	(357)	(231)
Derivative contracts at fair value	[1]	728	622
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities | Equity contracts
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Liability Derivatives, Gross		$ 1,085	852
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities | Credit contracts
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 June 30, 2021 and December 31, 2020 was $995 million and $872 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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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