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Financial Instruments Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Unrealized Gain On Derivative Contracts |  | $ 785 | $ 182
Derivative contracts, at fair value (liability) |  | 639 | 1,224
Investment Segment |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Collateral for derivative positions |  | 872 | 903
Investment Segment | Not designated as hedging instrument | Other assets [Member] |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Asset derivatives, Gross |  | 1,016 | 291
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1] | (231) | (109)
Unrealized Gain On Derivative Contracts | [1] | 785 | 182
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 |  | 853 | 1,324
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1] | (231) | (109)
Derivative contracts, at fair value (liability) | [1] | 622 | 1,215
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 |  | 4 | 291
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 |  | 852 | 1,058
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 |  | 1,012 |
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 | $ 266
[1] | Excludes netting of cash collateral received and posted. The total collateral posted at December 31, 2020 and 2019 was $872 million and $903 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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- 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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