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Reporting Segments (Details 2) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information                      
Property-liability insurance premiums                 $ 30,309 $ 28,929 $ 27,618
Life and annuity premiums and contract charges                 2,158 2,157 2,352
Net investment income                 3,156 3,459 3,943
Realized capital gains and losses                 30 694 594
Revenues $ 8,691 $ 9,028 $ 8,982 $ 8,952 $ 8,759 $ 8,936 $ 8,860 $ 8,684 35,653 35,239 34,507
Property-Liability                      
Segment Reporting Information                      
Property-liability insurance premiums                 30,309 28,928 27,618
Net investment income                 1,237 1,301 1,375
Realized capital gains and losses                 (237) 549 519
Revenues                 31,309 30,779 29,512
Property-Liability | Auto                      
Segment Reporting Information                      
Property-liability insurance premiums                 20,410 19,344 18,449
Property-Liability | Homeowners                      
Segment Reporting Information                      
Property-liability insurance premiums                 7,136 6,904 6,613
Property-Liability | Other personal lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 1,692 1,662 1,629
Property-Liability | Commercial lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 510 476 456
Property-Liability | Other business lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 561 542 471
Discontinued Lines and Coverages                      
Segment Reporting Information                      
Property-liability insurance premiums                 0 1 0
Allstate Financial                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 2,158 2,157 2,352
Net investment income                 1,884 2,131 2,538
Realized capital gains and losses                 267 144 74
Revenues                 4,309 4,432 4,964
Allstate Financial | Total life and annuity premiums                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 1,322 1,259 1,248
Allstate Financial | Traditional life insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 542 511 491
Allstate Financial | Immediate annuities with life contingencies                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 0 4 37
Allstate Financial | Accident and health insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 780 744 720
Allstate Financial | Total contract charges                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 836 898 1,104
Allstate Financial | Interest-sensitive life insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 822 879 1,086
Allstate Financial | Fixed annuities                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 14 19 18
Corporate and Other                      
Segment Reporting Information                      
Net investment income                 35 27 30
Realized capital gains and losses                 0 1 1
Service fees                 3 5 9
Total Corporate and Other before reclassification of service fees                 38 33 40
Reclassification of service fees                 (3) (5) (9)
Revenues                 $ 35 $ 28 $ 31