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Subsidiary Undertakings (Tables)
 12 Months Ended
Dec. 31, 2014
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]  
List of Group's subsidiary undertakings
Subsidiary name
 
Country of registration
 
Class of share
 
Percentage ownership
Holding companies
 
 
 
 
 
 

TAI Limited
 
England and Wales
 
Ordinary shares
 
100
%
Trinity Acquisition Limited
 
England and Wales
 
Ordinary shares
 
100
%
Willis Faber Limited
 
England and Wales
 
Ordinary shares
 
100
%
Willis Group Limited
 
England and Wales
 
Ordinary shares
 
100
%
Willis Investment UK Holdings Limited
 
England and Wales
 
Ordinary shares
 
100
%
Willis Netherlands Holdings B.V.
 
Netherlands
 
Ordinary shares
 
100
%
Willis Europe B.V.
 
England and Wales
 
Ordinary shares
 
100
%
Insurance broking companies
 
 
 
 
 
 

Willis HRH, Inc. 
 
USA
 
Common shares
 
100
%
Willis Limited
 
England and Wales
 
Ordinary shares
 
100
%
Willis North America, Inc. 
 
USA
 
Common shares
 
100
%
Willis Re, Inc. 
 
USA
 
Common shares
 
100
%