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Financial Instruments Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |
Derivative contracts at fair value (liability) |  | $ 461 |  | $ 36 |
Investment Segment |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |
Collateral for derivative positions |  | 314 |  | 0 |
Investment Segment | Not designated as hedging instrument | Other assets |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |
Asset Derivatives, Gross | [1] | 188 |  | 651 |
Netting across contract types | [1],[2] | (55) |  | (134) |
Derivative contracts, at fair value (asset) |  | 133 |  | 517 | [1],[2]
Investment Segment | Not designated as hedging instrument | Other assets | Equity contracts |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |
Asset Derivatives, Gross | [1] | 188 |  | 568 |
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] | 0 |  | 76 |
Investment Segment | Not designated as hedging instrument | Other assets | Commodity contracts |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |
Asset Derivatives, Gross |  | 0 |  | 7 | [1]
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 |  | 516 |  | 170 |
Netting across contract types |  | (55) |  | (134) |
Derivative contracts at fair value (liability) |  | 461 | [2] | 36 |
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 |  | 408 |  | 170 |
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 |  | 108 |  | 0 |
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities | Commodity contracts |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |
Liability Derivatives, Gross |  | $ 0 |  | $ 0 |
[1] | Net asset derivatives are classified within other assets in our condensed consolidated balance sheets.
[2] | Excludes netting of cash collateral received and posted. The total collateral posted at September 30, 2019 and December 31, 2018 was $314 million and $0 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 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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