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Derivative Instruments (Open Credit Default Swap Liabilities) (Details) - Open Credit Default Swap Liabilities [Member]
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
item
Summary Of Credit Derivatives  
Number of instruments | item 2
Maximum potential payout | $ $ 40
3/20/2017 maturity  
Summary Of Credit Derivatives  
Credit rating of underlying obligation BBB+ [1]
Number of instruments | item 2
Maximum potential payout | $ $ 40
[1] Represents average credit ratings based on the midpoint of the applicable ratings among Moody’s, S&P and Fitch Ratings, as scaled to the corresponding S&P ratings.