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Property Casualty Loss And Loss Expenses (Consolidated Property Casualty Loss And Loss Expense Reserves) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Insurance [Abstract]        
Gross loss and loss expense reserves, January 1 $ 4,241 $ 4,169 $ 4,280 $ 4,137
Less reinsurance receivable 356 375 326  
Net loss and loss expense reserves, January 1 3,942 3,813 3,905 3,811
Current accident year 2,448 2,533 2,620  
Prior accident years (147) (396) (285)  
Total incurred 2,301 2,137 2,335  
Current accident year 1,045 1,123 1,206  
Prior accident years 1,127 1,106 1,035  
Total paid 2,172 2,229 2,241  
Net loss and loss expense reserves, December 31 3,942 3,813 3,905 3,811
Plus reinsurance receivable 299 356 375  
Gross loss and loss expense reserves, December 31 $ 4,241 $ 4,169 $ 4,280 $ 4,137