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Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions		Mar. 31, 2021		Dec. 31, 2020
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Derivative contracts, at fair value		$ 855		$ 785
Derivative contracts at fair value		584		639
Investment Segment
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Collateral for derivative positions		936		872
Investment Segment | Not designated as hedging instrument | Other assets.
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Asset Derivatives, Gross		1,067		1,016
Netting across contract types	[1]	(218)		(231)
Derivative contracts, at fair value		849		785	[1]
Investment Segment | Not designated as hedging instrument | Other assets. | Equity contracts
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Asset Derivatives, Gross		11		4
Investment Segment | Not designated as hedging instrument | Other assets. | Credit contracts
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]
Asset Derivatives, Gross		1,056		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		739		853
Netting across contract types		(218)		(231)
Derivative contracts at fair value		521	[1]	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		737		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		$ 2		$ 1
[1] Excludes netting of cash collateral received and posted. The total collateral posted at March 31, 2021 and December 31, 2020 was $936 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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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 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

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