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Financings And Capitalization (Issuance Of Common Stock) (Details) (Continuous Equity Program [Member], USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended |
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Jun. 30, 2012
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Sep. 30, 2012
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Continuous Equity Program [Member]
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| Aggregate sales price of an equity offering program | $ 50 | |
| Shares of common stock issued | 650,235 | 1,413,160 |
| Per share value of common stock issued | $ 23.07 | |
| Value of common stock issued | $ 15 | $ 30 |