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Financial Instruments Derivative Activities Table (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Credit swaps(1) |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  | $ 2,600.0 | $ 10,000.0
Primary underlying risk: |  |  |
Long Notional Exposure | [1] | 202.0 | 187.0
Short Notional Exposure | [1] | 472.0 | 2,306.0
Equity swaps |  |  |
Primary underlying risk: |  |  |
Long Notional Exposure |  | 112.0 | 1,343.0
Short Notional Exposure |  | 14,094.0 | 14,167.0
Foreign currency forwards |  |  |
Primary underlying risk: |  |  |
Long Notional Exposure |  | 0.0 | 0.0
Short Notional Exposure |  | 0.0 | 842.0
Interest rate contracts(2) |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | 16,000.0
Notional Exposure of Derivatives, Short Position, less than three months |  |  | 74.0
Primary underlying risk: |  |  |
Long Notional Exposure | [2] | 0.0 | 0.0
Short Notional Exposure | [2] | 0.0 | 137.0
Commodity contracts |  |  |
Primary underlying risk: |  |  |
Long Notional Exposure |  | 16.0 | 43.0
Short Notional Exposure |  | $ 754.0 | $ 643.0
[1] | The short notional amount on our credit default swap positions is approximately $2.6 billion and $10.0 billion as of December 31, 2016 and 2015, respectively. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is approximately $0.5 billion and $2.3 billion as of December 31, 2016 and 2015, respectively.
[2] | The short notional amount on certain of our interest rate contracts with a three month duration is approximately $16.0 billion as of December 31, 2015. We assume that interest rates will not fall below zero and therefore our downside short notional exposure to loss on these contracts is $74 million (of the total $137 million disclosed in the above table) as of December 31, 2015.

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