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Derivative Financial Instruments - FGL's Exposure to Credit Loss on Call Options Held (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Sep. 30, 2012
Derivatives, Fair Value [Line Items]    
Notional Amount $ 5,995.3 $ 5,830.4
Fair Value 156.4 200.7
Bank of America [Member]
   
Derivatives, Fair Value [Line Items]    
Notional Amount 1,760.5 1,884.0
Fair Value 45.1 64.1
Credit Rating (Moody's/S&P) Baa2/A-  
Deutsche Bank [Member]
   
Derivatives, Fair Value [Line Items]    
Notional Amount 1,892.7 1,816.5
Fair Value 46.8 61.7
Credit Rating (Moody's/S&P) A2/A+  
Morgan Stanley [Member]
   
Derivatives, Fair Value [Line Items]    
Notional Amount 1,869.8 1,634.7
Fair Value 43.4 51.6
Credit Rating (Moody's/S&P) Baa1/A-  
Royal Bank of Scotland [Member]
   
Derivatives, Fair Value [Line Items]    
Notional Amount 352.4 353.9
Fair Value 15.2 19.6
Credit Rating (Moody's/S&P) Baa1/A-  
Barclay's Bank [Member]
   
Derivatives, Fair Value [Line Items]    
Notional Amount 119.9 131.3
Fair Value 2.0 3.1
Credit Rating (Moody's/S&P) A2/A+  
Credit Suisse [Member]
   
Derivatives, Fair Value [Line Items]    
Notional Amount   10.0
Fair Value   $ 0.6
Credit Rating (Moody's/S&P) A2/A