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Reporting Segments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information    
Property-liability insurance premiums $ 7,723 $ 7,426
Life and annuity premiums and contract charges 566 537
Net investment income 731 850
Realized capital gains and losses (149) 139
Total revenues 8,871 8,952
Property-Liability    
Segment Reporting Information    
Property-liability insurance premiums 7,723 7,426
Net investment income 302 358
Realized capital gains and losses (99) 28
Total revenues 7,926 7,812
Property-Liability | Auto    
Segment Reporting Information    
Property-liability insurance premiums 5,220 4,979
Property-Liability | Homeowners    
Segment Reporting Information    
Property-liability insurance premiums 1,810 1,761
Property-Liability | Other personal lines    
Segment Reporting Information    
Property-liability insurance premiums 421 420
Property-Liability | Commercial lines    
Segment Reporting Information    
Property-liability insurance premiums 129 125
Property-Liability | Other business lines    
Segment Reporting Information    
Property-liability insurance premiums 143 141
Allstate Financial    
Segment Reporting Information    
Life and annuity premiums and contract charges 566 537
Net investment income 419 484
Realized capital gains and losses (49) 111
Total revenues 936 1,132
Allstate Financial | Total life and annuity premiums    
Segment Reporting Information    
Life and annuity premiums and contract charges 354 328
Allstate Financial | Traditional life insurance    
Segment Reporting Information    
Life and annuity premiums and contract charges 138 132
Allstate Financial | Accident and health insurance    
Segment Reporting Information    
Life and annuity premiums and contract charges 216 196
Allstate Financial | Total contract charges    
Segment Reporting Information    
Life and annuity premiums and contract charges 212 209
Allstate Financial | Interest-sensitive life insurance    
Segment Reporting Information    
Life and annuity premiums and contract charges 209 206
Allstate Financial | Fixed annuities    
Segment Reporting Information    
Life and annuity premiums and contract charges 3 3
Corporate and Other    
Segment Reporting Information    
Net investment income 10 8
Realized capital gains and losses (1) 0
Service fees 1 1
Total Corporate and Other before reclassification of service fees 10 9
Reclassification of service fees (1) (1)
Total revenues $ 9 $ 8