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Hardy (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Hardy [Member]
Dec. 31, 2011
Hardy [Member]
Jul. 03, 2012
Hardy [Domain]
Business Acquisition [Line Items]            
Gross written premiums         $ 430  
Net income (loss) in accordance with IFRS         (55)  
Business acquisition, cost of acquired entity, purchase price           231
Business combination, acquisition related costs       4    
Amortization of deferred acquisition costs 1,274 1,176 1,168 33    
Amortization expense included in other expenses       10    
Finite-lived intangible assets, amortization expense, next twelve months       21    
Finite-lived intangible assets, amortization expense, year two       4    
Finite-lived intangible assets, amortization expense, year three       1    
Finite-lived intangible assets, amortization expense, year four       2    
Finite-lived intangible assets, amortization expense, year five       $ 2