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Financings (Issuance of Common Stock) (Details) (USD $) In Millions, except Share data |  |  | 3 Months Ended
--- | --- | --- | ---
Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2011 Continuous Equity Program [Member] | Jun. 30, 2011 Continuous Equity Program [Member]
Aggregate sales price of an equity offering program |  |  | $ 50 |
Shares of common stock issued |  |  |  | 762,925
Per share value of common stock issued |  |  |  | $ 19.66
Value of common stock issued |  |  |  | 15
Issuance of Common Stock Net Proceeds | $ 3 | $ 2 |  |

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