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Derivative Financial Instruments Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Investment Segment |  |
Derivative [Line Items] |  |
Fair value derivative instruments with credit risk related contingent features in a liability position | $ 17 | $ 39
Accrued expenses and other liabilities | Not designated as hedging instrument |  |
Derivative [Line Items] |  |
Derivative contracts at fair value (liability) | $ 1,673 | $ 1,139

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