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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Investments Accounted For Under The Equity Method [Member]
Sep. 30, 2012
Investments Accounted For Under The Equity Method [Member]
Sep. 30, 2011
Investments Accounted For Under The Equity Method [Member]
Dec. 31, 2013
Partnership Interest [Member]
Dec. 31, 2012
Partnership Interest [Member]
Dec. 31, 2011
Partnership Interest [Member]
Schedule of Equity Method Investments [Line Items]                                  
Net Investment Income                       $ 406,000,000 $ 226,000,000 $ 564,000,000      
Realized gains                       913,000,000 1,015,000,000 893,000,000      
Net change in unrealized appreciation (depreciation)                       382,000,000 (100,000,000) 1,485,000,000      
Net Income                       1,701,000,000 1,141,000,000 2,942,000,000      
Net investment income earned $ 35,313,000 $ 32,457,000 $ 34,003,000 $ 32,870,000 $ 34,593,000 $ 30,650,000 $ 34,006,000 $ 32,628,000 $ 134,643,000 $ 131,877,000 $ 147,443,000       $ 15,000,000 $ 9,000,000 $ 21,000,000