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Financial Instruments Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Derivative contracts at fair value (liability) |  | $ 460 |  | $ 460 |  | $ 1,275
Not designated as hedging instrument | Other assets |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Asset Derivatives, Gross | [1] | 32 |  | 32 |  | 7
Netting across contract types | [1],[2] | (5) |  | (5) |  | (7)
Derivative contracts, at fair value (asset) | [1],[2] | 27 |  | 27 |  | 0
Not designated as hedging instrument | Other assets | Equity contracts |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Asset Derivatives, Gross | [1] | 16 |  | 16 |  | 0
Not designated as hedging instrument | Other assets | Credit contracts |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Asset Derivatives, Gross | [1] | 0 |  | 0 |  | 0
Not designated as hedging instrument | Other assets | Commodity contracts |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Asset Derivatives, Gross | [1] | 16 |  | 16 |  | 7
Not designated as hedging instrument | Accrued expenses and other liabilities |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Liability Derivatives, Gross |  | 465 |  | 465 |  | 1,282
Netting across contract types | [2] | (5) |  | (5) |  | (7)
Derivative contracts at fair value (liability) | [2] | 460 |  | 460 |  | 1,275
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 |  | 433 |  | 433 |  | 1,159
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 |  | 17
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 |  | 32 |  | 32 |  | 106
Investment Segment |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Collateral for derivative positions |  | 252 |  | 252 |  | $ 542
Net gain from investment activities | Not designated as hedging instrument |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [3] | (128) | $ (265) | 78 | $ (868) |
Net gain from investment activities | Not designated as hedging instrument | Equity contracts |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [3] | (147) | (262) | (89) | (835) |
Net gain from investment activities | Not designated as hedging instrument | Credit contracts |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [3] | 0 | 8 | 53 | (17) |
Net gain from investment activities | Not designated as hedging instrument | Commodity contracts |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [3] | 19 | (11) | 114 | (16) |
Net gain from investment activities | Investment Segment | Not designated as hedging instrument |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [3] | (139) | (265) | 8 | (880) |
Other Operating Income (Expense) [Member] | Other Segments | Not designated as hedging instrument |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items] |  |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [3] | $ 11 | $ 0 | $ 70 | $ 12 |
[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 June 30, 2018 and December 31, 2017 was $252 million and $542 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash on the condensed consolidated balance sheets.
[3] | Gains (losses) recognized on derivatives are classified in net gain (loss) from investment activities in our condensed consolidated statements of operations for our Investment segment and are included in other income (loss), net for all other segments. Gains (losses) recognized on derivatives for our Investment segment were $(139) million and $(265) million for the three months ended June 30, 2018 and 2017, respectively, and $8 million and $(880) million for the six months ended June 30, 2018 and 2017, respectively. Gains recognized on derivatives for our other segments were $11 million and zero for the three months ended June 30, 2018 and 2017, respectively, and $70 million and $12 million for the six months ended June 30, 2018 and 2017, respectively.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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