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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information        
Property-liability insurance premiums $ 6,972 $ 6,697 $ 20,604 $ 19,993
Life and annuity premiums and contract charges 584 563 1,742 1,675
Net investment income 950 940 2,917 2,977
Realized capital gains and losses (41) (72) 452 123
Consolidated revenues 8,465 8,128 25,715 24,768
Property-Liability
       
Segment Reporting Information        
Property-liability insurance premiums 6,972 6,697 20,604 19,993
Net investment income 309 299 993 964
Realized capital gains and losses (26) (16) 391 192
Consolidated revenues 7,255 6,980 21,988 21,149
Property-Liability | Total auto
       
Segment Reporting Information        
Property-liability insurance premiums 4,645 4,487 13,774 13,419
Property-Liability | Standard auto
       
Segment Reporting Information        
Property-liability insurance premiums 4,483 4,310 13,277 12,875
Property-Liability | Non-standard auto
       
Segment Reporting Information        
Property-liability insurance premiums 162 177 497 544
Property-Liability | Homeowners
       
Segment Reporting Information        
Property-liability insurance premiums 1,679 1,595 4,925 4,747
Property-Liability | Other personal lines
       
Segment Reporting Information        
Property-liability insurance premiums 648 614 1,905 1,826
Allstate Protection
       
Segment Reporting Information        
Property-liability insurance premiums 6,972 6,696 20,604 19,992
Discontinued Lines and Coverages
       
Segment Reporting Information        
Property-liability insurance premiums   1   1
Allstate Financial
       
Segment Reporting Information        
Life and annuity premiums and contract charges 584 563 1,742 1,675
Net investment income 633 632 1,901 1,982
Realized capital gains and losses (16) (56) 60 (69)
Consolidated revenues 1,201 1,139 3,703 3,588
Allstate Financial | Total life and annuity premiums
       
Segment Reporting Information        
Life and annuity premiums and contract charges 306 291 916 869
Allstate Financial | Traditional life insurance
       
Segment Reporting Information        
Life and annuity premiums and contract charges 120 117 355 347
Allstate Financial | Immediate annuities with life contingencies
       
Segment Reporting Information        
Life and annuity premiums and contract charges 6 10 22 36
Allstate Financial | Accident and health insurance:
       
Segment Reporting Information        
Life and annuity premiums and contract charges 180 164 539 486
Allstate Financial | Total contract charges
       
Segment Reporting Information        
Life and annuity premiums and contract charges 278 272 826 806
Allstate Financial | Interest-sensitive life insurance
       
Segment Reporting Information        
Life and annuity premiums and contract charges 272 267 813 790
Allstate Financial | Fixed annuities
       
Segment Reporting Information        
Life and annuity premiums and contract charges 6 5 13 16
Corporate and Other
       
Segment Reporting Information        
Service fees 3 1 6 3
Net investment income 8 9 23 31
Realized capital gains and losses 1   1  
Total Corporate and Other before reclassification of service fees 12 10 30 34
Reclassification of service fees (3) (1) (6) (3)
Consolidated revenues $ 9 $ 9 $ 24 $ 31