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Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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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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- Definition Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] + References No definition available. + Details
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- Definition Unrealized Gain On Derivative Contracts + 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=109980867&loc=SL5624258-113959 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 + Details
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