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Derivative Instruments (Open Credit Default Swap Liabilities) (Details) - Open Credit Default Swap Liabilities [Member] $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) item | Dec. 31, 2016 USD ($) item
Summary Of Credit Derivatives |  |  |
Number of instruments | item |  | 1 | 2
Fair value | [1] | $ 1 |
Maximum potential payout |  | $ 63 | $ 40
3/20/2017 maturity |  |  |
Summary Of Credit Derivatives |  |  |
Credit rating of underlying obligation | [2] |  | BBB+
Number of instruments | item |  |  | 2
Maximum potential payout |  |  | $ 40
6/20/2022 maturity |  |  |
Summary Of Credit Derivatives |  |  |
Credit rating of underlying obligation | [2] | BBB+ |
Number of instruments | item |  | 1 |
Fair value | [1] | $ 1 |
Maximum potential payout |  | $ 63 |
[1] | Broker quotes are used to determine the market value of our credit default swaps.
[2] | 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.

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