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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
LB Re
Mar. 31, 2012
RBI
AHL
7.00% Note due 2017
Mar. 31, 2012
RBI
AHL
5.80% Note due 2018
Related Party Transactions          
Repayment of principal amount       $ 1 $ 3
Interest rate (as a percent)       7.00% 5.80%
Reinsurance recoverables 4,440 4,457 2    
Reinsurance payable     3    
Loss on the transaction     $ 1