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Segments Information (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Revenues [Abstract]    
Premiums Earned$ 2,932$ 2,798$ 8,699$ 8,379
Investment Income4154121,2351,248
Corporate and other revenues13174171
Realized investment gains, Net7154300271
Total Revenues3,4203,26710,2409,908
Property and casualty insurance [Member]
    
Revenues [Abstract]    
Premiums earned related to insurance business2,9292,7958,6938,368
Premiums earned related to reinsurance assumed33611
Premiums Earned2,9322,7988,6998,379
Investment Income4043981,2001,187
Total property and casualty insurance revenues3,3363,1969,8999,566
Property and casualty insurance [Member] | Personal insurance [Member]
    
Revenues [Abstract]    
Premiums earned related to insurance business9879422,9242,800
Property and casualty insurance [Member] | Commercial insurance [Member]
    
Revenues [Abstract]    
Premiums earned related to insurance business1,2491,1593,6923,475
Property and casualty insurance [Member] | Specialty Insurance [Member]
    
Revenues [Abstract]    
Premiums earned related to insurance business$ 693$ 694$ 2,077$ 2,093