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Derivative Financial Instruments Derivative Activities Table (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Equity contracts |  |  |
Derivative [Line Items] |  |  |
Long Notional Exposure |  | $ 446 | $ 112
Short Notional Exposure |  | 13,504 | 14,094
Credit contracts |  |  |
Derivative [Line Items] |  |  |
Long Notional Exposure | [1] | 0 | 202
Short Notional Exposure | [1] | 481 | 472
Notional value of interest rate swap agreements |  | 2,700 | 2,600
Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Long Notional Exposure |  | 23 | 16
Short Notional Exposure |  | $ 301 | $ 754
[1] | The short notional amount on our credit default swap positions is approximately $2.7 billion and $2.6 billion as of March 31, 2017 and December 31, 2016, respectively. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is $481 million and $472 million as of March 31, 2017 and December 31, 2016, respectively.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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