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Financings And Capitalization (Issuance Of Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 4 Months Ended | 12 Months Ended
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Mar. 31, 2016 | Jul. 31, 2015 | Mar. 31, 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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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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