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Investments (Unconsolidated Variable Interest Entities - Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Tax Credits Guaranteed By Third Parties Amount That Reduces Maximum Exposure To Loss Related To Other Invested Assets $ 0   $ 0
Financial or other support to investees designated as VIEs $ 0 $ 0