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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information    
Property-liability insurance premiums $ 6,770 $ 6,630
Life and annuity premiums and contract charges 579 553
Net investment income 983 1,011
Realized capital gains and losses 131 168
Consolidated revenues 8,463 8,362
Property-Liability
   
Segment Reporting Information    
Net investment income 341 313
Realized capital gains and losses 112 189
Consolidated revenues 7,223 7,132
Property-Liability | Total auto
   
Segment Reporting Information    
Property-liability insurance premiums 4,530 4,452
Property-Liability | Standard auto
   
Segment Reporting Information    
Property-liability insurance premiums 4,363 4,269
Property-Liability | Non-standard auto
   
Segment Reporting Information    
Property-liability insurance premiums 167 183
Property-Liability | Homeowners
   
Segment Reporting Information    
Property-liability insurance premiums 1,616 1,572
Property-Liability | Other personal lines
   
Segment Reporting Information    
Property-liability insurance premiums 624 606
Allstate Protection
   
Segment Reporting Information    
Property-liability insurance premiums 6,770 6,630
Allstate Financial
   
Segment Reporting Information    
Life and annuity premiums and contract charges 579 553
Net investment income 635 687
Realized capital gains and losses 19 (21)
Consolidated revenues 1,233 1,219
Allstate Financial | Total life and annuity premiums
   
Segment Reporting Information    
Life and annuity premiums and contract charges 303 287
Allstate Financial | Traditional life insurance
   
Segment Reporting Information    
Life and annuity premiums and contract charges 116 113
Allstate Financial | Immediate annuities with life contingencies
   
Segment Reporting Information    
Life and annuity premiums and contract charges 7 12
Allstate Financial | Accident and health insurance:
   
Segment Reporting Information    
Life and annuity premiums and contract charges 180 162
Allstate Financial | Total contract charges
   
Segment Reporting Information    
Life and annuity premiums and contract charges 276 266
Allstate Financial | Interest-sensitive life insurance
   
Segment Reporting Information    
Life and annuity premiums and contract charges 273 260
Allstate Financial | Fixed annuities
   
Segment Reporting Information    
Life and annuity premiums and contract charges 3 6
Corporate and Other
   
Segment Reporting Information    
Service fees 1 1
Net investment income 7 11
Total Corporate and Other before reclassification of service fees 8 12
Reclassification of service fees (1) (1)
Consolidated revenues $ 7 $ 11