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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information        
Property-liability insurance premiums $ 6,862 $ 6,666 $ 13,632 $ 13,296
Life and annuity premiums and contract charges 579 559 1,158 1,112
Net investment income 984 1,026 1,967 2,037
Realized capital gains and losses 362 27 493 195
Consolidated revenues 8,787 8,278 17,250 16,640
Property-Liability
       
Segment Reporting Information        
Property-liability insurance premiums 6,862 6,666 13,632 13,296
Net investment income 343 352 684 665
Realized capital gains and losses 305 19 417 208
Consolidated revenues 7,510 7,037 14,733 14,169
Property-Liability | Total auto
       
Segment Reporting Information        
Property-liability insurance premiums 4,599 4,480 9,129 8,932
Property-Liability | Standard auto
       
Segment Reporting Information        
Property-liability insurance premiums 4,431 4,296 8,794 8,565
Property-Liability | Non-standard auto
       
Segment Reporting Information        
Property-liability insurance premiums 168 184 335 367
Property-Liability | Homeowners
       
Segment Reporting Information        
Property-liability insurance premiums 1,630 1,580 3,246 3,152
Property-Liability | Other personal lines
       
Segment Reporting Information        
Property-liability insurance premiums 633 606 1,257 1,212
Allstate Protection
       
Segment Reporting Information        
Property-liability insurance premiums 6,862 6,666 13,632 13,296
Allstate Financial
       
Segment Reporting Information        
Life and annuity premiums and contract charges 579 559 1,158 1,112
Net investment income 633 663 1,268 1,350
Realized capital gains and losses 57 8 76 (13)
Consolidated revenues 1,269 1,230 2,502 2,449
Allstate Financial | Total life and annuity premiums
       
Segment Reporting Information        
Life and annuity premiums and contract charges 307 291 610 578
Allstate Financial | Traditional life insurance
       
Segment Reporting Information        
Life and annuity premiums and contract charges 119 117 235 230
Allstate Financial | Immediate annuities with life contingencies
       
Segment Reporting Information        
Life and annuity premiums and contract charges 9 14 16 26
Allstate Financial | Accident and health insurance:
       
Segment Reporting Information        
Life and annuity premiums and contract charges 179 160 359 322
Allstate Financial | Total contract charges
       
Segment Reporting Information        
Life and annuity premiums and contract charges 272 268 548 534
Allstate Financial | Interest-sensitive life insurance
       
Segment Reporting Information        
Life and annuity premiums and contract charges 268 263 541 523
Allstate Financial | Fixed annuities
       
Segment Reporting Information        
Life and annuity premiums and contract charges 4 5 7 11
Corporate and Other
       
Segment Reporting Information        
Service fees 2 1 3 2
Net investment income 8 11 15 22
Total Corporate and Other before reclassification of service fees 10 12 18 24
Reclassification of service fees (2) (1) (3) (2)
Consolidated revenues $ 8 $ 11 $ 15 $ 22