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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information        
Property-liability insurance premiums $ 6,666 $ 6,457 $ 13,296 $ 12,905
Life and annuity premiums and contract charges 559 547 1,112 1,116
Net investment income 1,026 1,020 2,037 2,002
Realized capital gains and losses 27 57 195 153
Consolidated revenues 8,278 8,081 16,640 16,176
Property-Liability
       
Segment Reporting Information        
Net investment income 352 310 665 594
Realized capital gains and losses 19 (8) 208 49
Consolidated revenues 7,037 6,759 14,169 13,548
Property-Liability | Total auto
       
Segment Reporting Information        
Property-liability insurance premiums 4,480 4,299 8,932 8,598
Property-Liability | Standard auto
       
Segment Reporting Information        
Property-liability insurance premiums 4,296 4,093 8,565 8,181
Property-Liability | Non-standard auto
       
Segment Reporting Information        
Property-liability insurance premiums 184 206 367 417
Property-Liability | Homeowners
       
Segment Reporting Information        
Property-liability insurance premiums 1,580 1,548 3,152 3,087
Property-Liability | Other personal lines
       
Segment Reporting Information        
Property-liability insurance premiums 606 610 1,212 1,221
Allstate Protection
       
Segment Reporting Information        
Property-liability insurance premiums 6,666 6,457 13,296 12,906
Discontinued Lines and Coverages
       
Segment Reporting Information        
Property-liability insurance premiums       (1)
Allstate Financial
       
Segment Reporting Information        
Life and annuity premiums and contract charges 559 547 1,112 1,116
Net investment income 663 694 1,350 1,378
Realized capital gains and losses 8 62 (13) 101
Consolidated revenues 1,230 1,303 2,449 2,595
Allstate Financial | Total life and annuity premiums
       
Segment Reporting Information        
Life and annuity premiums and contract charges 291 286 578 598
Allstate Financial | Traditional life insurance
       
Segment Reporting Information        
Life and annuity premiums and contract charges 117 109 230 217
Allstate Financial | Immediate annuities with life contingencies
       
Segment Reporting Information        
Life and annuity premiums and contract charges 14 15 26 58
Allstate Financial | Accident and health insurance:
       
Segment Reporting Information        
Life and annuity premiums and contract charges 160 162 322 323
Allstate Financial | Total contract charges
       
Segment Reporting Information        
Life and annuity premiums and contract charges 268 261 534 518
Allstate Financial | Interest-sensitive life insurance
       
Segment Reporting Information        
Life and annuity premiums and contract charges 263 253 523 501
Allstate Financial | Fixed annuities
       
Segment Reporting Information        
Life and annuity premiums and contract charges 5 8 11 17
Corporate and Other
       
Segment Reporting Information        
Service fees 1 2 2 4
Net investment income 11 16 22 30
Realized capital gains and losses   3   3
Total Corporate and Other before reclassification of service fees 12 21 24 37
Reclassification of service fees (1) (2) (2) (4)
Consolidated revenues $ 11 $ 19 $ 22 $ 33