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Reporting Segments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information        
Property-liability insurance premiums $ 7,549 $ 7,204 $ 14,975 $ 14,268
Life and annuity premiums and contract charges 536 518 1,073 1,125
Net investment income 789 898 1,639 1,857
Realized capital gains and losses 108 240 247 294
Total revenues 8,982 8,860 17,934 17,544
Property-Liability        
Segment Reporting Information        
Property-liability insurance premiums 7,549 7,204 14,975 14,268
Net investment income 292 351 650 663
Realized capital gains and losses 49 250 77 303
Total revenues 7,890 7,805 15,702 15,234
Property-Liability | Auto        
Segment Reporting Information        
Property-liability insurance premiums 5,086 4,824 10,065 9,536
Property-Liability | Homeowners        
Segment Reporting Information        
Property-liability insurance premiums 1,775 1,714 3,536 3,411
Property-Liability | Other personal lines        
Segment Reporting Information        
Property-liability insurance premiums 423 414 843 826
Property-Liability | Commercial lines        
Segment Reporting Information        
Property-liability insurance premiums 128 121 253 231
Property-Liability | Other business lines        
Segment Reporting Information        
Property-liability insurance premiums 137 131 278 264
Allstate Protection        
Segment Reporting Information        
Property-liability insurance premiums 7,549 7,204 14,975 14,268
Discontinued Lines and Coverages        
Segment Reporting Information        
Property-liability insurance premiums 0 0 0 0
Allstate Financial        
Segment Reporting Information        
Life and annuity premiums and contract charges 536 518 1,073 1,125
Net investment income 489 538 973 1,178
Realized capital gains and losses 59 (10) 170 (9)
Total revenues 1,084 1,046 2,216 2,294
Allstate Financial | Total life and annuity premiums        
Segment Reporting Information        
Life and annuity premiums and contract charges 326 312 654 639
Allstate Financial | Traditional life insurance        
Segment Reporting Information        
Life and annuity premiums and contract charges 131 125 263 252
Allstate Financial | Immediate annuities with life contingencies        
Segment Reporting Information        
Life and annuity premiums and contract charges 0 0 0 5
Allstate Financial | Accident and health insurance        
Segment Reporting Information        
Life and annuity premiums and contract charges 195 187 391 382
Allstate Financial | Total contract charges        
Segment Reporting Information        
Life and annuity premiums and contract charges 210 206 419 486
Allstate Financial | Interest-sensitive life insurance        
Segment Reporting Information        
Life and annuity premiums and contract charges 207 202 413 476
Allstate Financial | Fixed annuities        
Segment Reporting Information        
Life and annuity premiums and contract charges 3 4 6 10
Corporate and Other        
Segment Reporting Information        
Service fees 1 1 2 3
Net investment income 8 9 16 16
Total Corporate and Other before reclassification of service fees 9 10 18 19
Reclassification of service fees (1) (1) (2) (3)
Total revenues $ 8 $ 9 $ 16 $ 16