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Derivative Instruments (Open Credit Default Swap Liabilities) (Details) - Open Credit Default Swap Liabilities [Member] $ in Millions | 12 Months Ended
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Dec. 31, 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 |  | $ 52 | $ 40
BBB+ [Member] | 3/20/2017 Maturity [Member] |  |  |
Summary Of Credit Derivatives |  |  |
Credit rating of underlying obligation |  |  | BBB+
Number of instruments | item |  |  | 2
Maximum potential payout |  |  | $ 40
BBB+ [Member] | Maturity 12/20/2022 [Member] |  |  |
Summary Of Credit Derivatives |  |  |
Credit rating of underlying obligation |  | 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.

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