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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative [Line Items] |
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location | The following table presents the consolidated fair values of our derivatives that are not designated as hedging instruments in accordance with U.S GAAP:
|  | Asset Derivatives(1) |  | Liability Derivatives
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2018 |  | December 31, 2017
|  | (in millions)
Equity contracts |  | $ | 568 |  |  | $ | — |  |  | $ | 170 |  |  | $ | 1,159 |
Credit contracts |  | 76 |  |  | — |  |  | — |  |  | 17 |
Commodity contracts |  | 15 |  |  | 7 |  |  | 1 |  |  | 106 |
Sub-total |  | 659 |  |  | 7 |  |  | 171 |  |  | 1,282 |
Netting across contract types(2) |  | (135 | ) |  | (7 | ) |  | (135 | ) |  | (7 | )
Total(2) |  | $ | 524 |  |  | $ | — |  |  | $ | 36 |  |  | $ | 1,275 |
(1) | Net asset derivatives are located within other assets in our consolidated balance sheets.
(2) | Excludes netting of cash collateral received and posted. The total collateral posted at December 31, 2018 and 2017 was $0 million and $542 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in our consolidated balance sheets.
The following table presents the amount of gain (loss) recognized in the consolidated statements of operations for our derivatives not designated as hedging instruments:
| Gain (Loss) Recognized in Income(1)
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in millions)
Equity contracts | $ | 603 |  |  | $ | (1,815 | ) |  | $ | (1,609 | )
Foreign exchange contracts | — |  |  | — |  |  | 35 |
Credit contracts | 129 |  |  | (42 | ) |  | 44 |
Interest rate contracts | — |  |  | — |  |  | (28 | )
Commodity contracts | 212 |  |  | (182 | ) |  | (101 | )
| $ | 944 |  |  | $ | (2,039 | ) |  | $ | (1,659 | )
(1) Gains (losses) recognized on derivatives are classified in net gain from investment activities in our consolidated statements of operations for our Investment segment and are included in cost of goods sold for our Energy segment. Gains (losses) recognized on derivatives for our Investment segment were $798 million, $(1,969) million and $(1,640) million for the years ended December 31, 2018, 2017 and 2016, respectively. Gains (losses) recognized on derivatives for our Energy segment were $146 million, $(70) million and $(19) million for the years ended December 31, 2018, 2017 and 2016, respectively.
Investment Segment |
Derivative [Line Items] |
Schedule of Notional Amounts of Outstanding Derivative Positions |
| December 31, 2018 |  | December 31, 2017
| Long Notional Exposure |  | Short Notional Exposure |  | Long Notional Exposure |  | Short Notional Exposure
Primary underlying risk: | (in millions)
Equity contracts | $ | 118 |  |  | $ | 8,368 |  |  | $ | 243 |  |  | $ | 6,660 |
Credit contracts(1) | — |  |  | 479 |  |  | — |  |  | 391 |
Commodity contracts | — |  |  | 114 |  |  | — |  |  | 634 |
(1) | The short notional amount on our credit default swap positions was approximately $1.8 billion as of December 31, 2018. However, because credit spreads cannot compress below zero, our downside short notional exposure is $479 million as of December 31, 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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