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Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Schedule of Equity Method Investments [Line Items]                            
Net Investment Income                   $ 226,000,000   $ 564,000,000   $ 563,000,000
Realized gains (losses)                   1,015,000,000   893,000,000   (358,000,000)
Net change in unrealized appreciation (depreciation)                   (100,000,000)   1,485,000,000   2,250,000,000
Net Income                   1,141,000,000   2,942,000,000   2,455,000,000
Net investment income earned 34,593,000 30,650,000 34,006,000 32,628,000 28,839,000 35,786,000 39,345,000 43,473,000 131,877,000   147,443,000   145,708,000  
Partnership Interest [Member]
                            
Schedule of Equity Method Investments [Line Items]                            
Net investment income earned                 $ 9,000,000   $ 21,000,000   $ 20,000,000