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Financial Instruments Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Derivative contracts at fair value (liability) |  | $ 722 | $ 36
Not designated as hedging instrument | Other assets |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Asset Derivatives, Gross | [1] | 41 | 659
Netting across contract types | [1],[2] | (14) | (135)
Derivative contracts, at fair value (asset) | [1],[2] | 27 | 524
Not designated as hedging instrument | Other assets | Equity contracts |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Asset Derivatives, Gross | [1] | 28 | 568
Not designated as hedging instrument | Other assets | Credit contracts |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Asset Derivatives, Gross | [1] | 12 | 76
Not designated as hedging instrument | Other assets | Commodity contracts |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Asset Derivatives, Gross | [1] | 1 | 15
Not designated as hedging instrument | Accrued expenses and other liabilities |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Liability Derivatives, Gross |  | 736 | 171
Netting across contract types | [2] | (14) | (135)
Derivative contracts at fair value (liability) | [2] | 722 | 36
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 |  | 736 | 170
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 |  | 0 | 0
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 | 1
Investment Segment |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |
Collateral for derivative positions |  | $ 613 | $ 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 March 31, 2019 and December 31, 2018 was $613 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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