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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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- Definition Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624258-113959 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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