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Derivative Instruments (Open Credit Default Swap Liabilities) (Details) - Open Credit Default Swap Liabilities [Member] $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 USD ($) item
Summary Of Credit Derivatives |  |  |
Number of instruments | item |  |  | 1
Fair value | [1] |  | $ 1
Maximum potential payout |  |  | $ 52
Maturity 12/20/2022 [Member] |  |  |
Summary Of Credit Derivatives |  |  |
Maturity |  | Dec. 20, 2022 |
Credit rating of underlying obligation | [2] |  | BBB+
Number of instruments | item |  |  | 1
Fair value | [1] |  | $ 1
Maximum potential payout |  |  | $ 52
[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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