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Schedule of Other Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets $ 64 $ 76
Indefinite-lived intangible assets 59 68
Intangible Assets, Gross (Excluding Goodwill) 123 144
Accumulated Amortization 54 63
Lloyds syndicate capacity [Member]    
Indefinite-lived intangible assets 43 52
Agency Force [Member]    
Indefinite-lived intangible assets 16 16
Value of business acquired [Member]    
Finite-Lived Intangible Assets 48 57
Accumulated Amortization $ 48 57
Trade name [Member]    
Economic useful life measured in years 8 years  
Finite-Lived Intangible Assets $ 6 7
Accumulated Amortization $ 3 3
Distribution channel [Member]    
Economic useful life measured in years 15 years  
Finite-Lived Intangible Assets $ 10 12
Accumulated Amortization $ 3 $ 3
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