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Financings And Capitalization (Issuance Of Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 4 Months Ended | 18 Months Ended
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Mar. 31, 2016 | Jul. 31, 2015 | Sep. 30, 2016
Financings And Capitalization [Abstract] |  |  |
Number of Shares Issued | 1,449,171 | 888,610 | 2,337,781
Average Price Per Share | $ 41.40 | $ 33.76 | $ 38.50
Proceeds | $ 60 | $ 30 | $ 90

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