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Financial Instruments Derivative Activities Table (Details) - Investment Segment - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Equity contracts |  |  |
Derivative [Line Items] |  |  |
Long Notional Exposure |  | $ 239 | $ 243
Short Notional Exposure |  | 6,850 | 6,660
Credit contracts |  |  |
Derivative [Line Items] |  |  |
Long Notional Exposure | [1] | 0 | 0
Short Notional Exposure | [1] | 0 | 391
Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Long Notional Exposure |  | 0 | 0
Short Notional Exposure |  | $ 237 | 634
Credit Default Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Notional value of interest rate swap agreements |  |  | $ 2,500
[1] | 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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