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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
Derivative [Line Items] |
Fair value and income recognized for derivatives not designated as hedging instruments | The following table presents the consolidated fair values of our derivatives that are not designated as hedging instruments in accordance with U.S GAAP:
Derivatives Not Designated as Hedging Instruments |  | Asset Derivatives(1) |  | Liability Derivatives
| September 30, 2018 |  | December 31, 2017 |  | September 30, 2018 |  | December 31, 2017
|  | (in millions)
Equity contracts |  | $ | 32 |  |  | $ | — |  |  | $ | 953 |  |  | $ | 1,159 |
Credit contracts |  | 11 |  |  | — |  |  | — |  |  | 17 |
Commodity contracts |  | 5 |  |  | 7 |  |  | 38 |  |  | 106 |
Sub-total |  | 48 |  |  | 7 |  |  | 991 |  |  | 1,282 |
Netting across contract types(2) |  | (6 | ) |  | (7 | ) |  | (6 | ) |  | (7 | )
Total(2) |  | $ | 42 |  |  | $ | — |  |  | $ | 985 |  |  | $ | 1,275 |
(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, 2018 and December 31, 2017 was $573 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.
The following table presents the amount of gain (loss) recognized in the condensed consolidated statements of operations for our derivatives not designated as hedging instruments:
|  | Gain (Loss) Recognized in Income(1)
Derivatives Not Designated as Hedging Instruments |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
|  | (in millions)
Equity contracts |  | $ | (564 | ) |  | $ | (350 | ) |  | $ | (653 | ) |  | $ | (1,185 | )
Credit contracts |  | 12 |  |  | (15 | ) |  | 65 |  |  | (32 | )
Commodity contracts |  | 18 |  |  | (20 | ) |  | 132 |  |  | (36 | )
|  | $ | (534 | ) |  | $ | (385 | ) |  | $ | (456 | ) |  | $ | (1,253 | )
(1) | 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 $(539) million and $(368) million for the three months ended September 30, 2018 and 2017, respectively, and $(531) million and $(1,248) million for the nine months ended September 30, 2018 and 2017, respectively. Gains (losses) recognized on derivatives for our other segments were $5 million and $(17) million for the three months ended September 30, 2018 and 2017, respectively, and $75 million and $(5) million for the nine months ended September 30, 2018 and 2017, respectively.
Investment Segment |
Derivative [Line Items] |
Notional exposure of derivative instruments |
| September 30, 2018 |  | December 31, 2017
| Long Notional Exposure |  | Short Notional Exposure |  | Long Notional Exposure |  | Short Notional Exposure
Primary underlying risk: | (in millions)
Equity contracts | $ | 256 |  |  | $ | 10,050 |  |  | $ | 243 |  |  | $ | 6,660 |
Credit contracts(1) | — |  |  | 183 |  |  | — |  |  | 391 |
Commodity contracts | — |  |  | 122 |  |  | — |  |  | 634 |
(1) | The short notional amount on our credit default swap positions was approximately $800 million at September 30, 2018. However, because credit spreads cannot compress below zero, our downside short notional exposure is $183 million as of September 30, 2018. The short notional amount on our credit default swap positions was approximately $2.5 billion as of December 31, 2017. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is $391 million as of December 31, 2017.

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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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- Definition Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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