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Goodwill (details) - Goodwill by Segment (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Goodwill by segment    
Goodwill $ 3,365 $ 3,365
Business Insurance [Member]
   
Goodwill by segment    
Goodwill 2,168 2,168
Financial, Professional & International Insurance [Member]
   
Goodwill by segment    
Goodwill 557 557
Personal Insurance [Member]
   
Goodwill by segment    
Goodwill $ 613 $ 613