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Financings And Capitalization (Issuance Of Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 2 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jul. 07, 2015 | May. 31, 2015 | Jul. 07, 2015
Subsequent Event [Line Items] |  |  |
Number of Shares Issued |  | 587,181 |
Average Price Per Share |  | $ 34.10 |
Proceeds |  | $ 20 |
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of Shares Issued | 301,429 |  | 888,610
Average Price Per Share | $ 33.10 |  | $ 33.76
Proceeds | $ 10 |  | $ 30

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