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Hardy Schedule of intangible assets acquired (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Jul. 03, 2012
Indefinite-lived intangible assets   $ 55
Finite-lived intangible assets   81
Accumulated amortization 43  
Total intangible assets as of the acquisition date   136
Total intangible assets, accumulated amortization 43  
Lloyds syndicate capacity [Member]
    
Indefinite-lived intangible assets   55
Value of business acquired [Member]
    
Finite-lived intangible assets   60
Accumulated amortization 43  
Trade name [Member]
    
Economic useful life measured in years 8 years  
Finite-lived intangible assets   8
Accumulated amortization     
Distribution channel [Member]
    
Economic useful life measured in years 15 years  
Finite-lived intangible assets   13
Accumulated amortization     
Minimum [Member] | Value of business acquired [Member]
    
Economic useful life measured in years 1 year  
Maximum [Member] | Value of business acquired [Member]
    
Economic useful life measured in years 4 years