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Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available-for-sale debt securities, amortized cost basis $ 2,802.5 $ 2,460.9
Common stock par value $ 5,000  
common stock shares authorized 1,000  
common stock shares issued 500  
As restated and amended [Member]
   
Available-for-sale debt securities, amortized cost basis   $ 2,460.9
Common stock par value   $ 5,000
common stock shares authorized   1,000
common stock shares issued   500