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Reporting Segments (Details 2) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information                      
Property-liability insurance premiums                 $ 31,307 $ 30,309 $ 28,929
Life and annuity premiums and contract charges                 2,275 2,158 2,157
Net investment income                 3,042 3,156 3,459
Realized capital gains and losses                 (90) 30 694
Revenues $ 9,278 $ 9,221 $ 9,164 $ 8,871 $ 8,691 $ 9,028 $ 8,982 $ 8,952 36,534 35,653 35,239
Property-Liability                      
Segment Reporting Information                      
Net investment income                 1,266 1,237 1,301
Realized capital gains and losses                 (6) (237) 549
Revenues                 32,567 31,309 30,779
Property-Liability | Auto                      
Segment Reporting Information                      
Property-liability insurance premiums                 21,264 20,410 19,344
Property-Liability | Homeowners                      
Segment Reporting Information                      
Property-liability insurance premiums                 7,257 7,136 6,904
Property-Liability | Other personal lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 1,700 1,692 1,662
Property-Liability | Commercial lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 506 510 476
Property-Liability | Other business lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 580 561 542
Allstate Protection                      
Segment Reporting Information                      
Property-liability insurance premiums                 31,307 30,309 28,928
Discontinued Lines and Coverages                      
Segment Reporting Information                      
Property-liability insurance premiums                 0 0 1
Allstate Financial                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 2,275 2,158 2,157
Net investment income                 1,734 1,884 2,131
Realized capital gains and losses                 (81) 267 144
Revenues                 3,928 4,309 4,432
Allstate Financial | Traditional life insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 573 542 511
Allstate Financial | Immediate annuities with life contingencies                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 0 0 4
Allstate Financial | Accident and health insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 859 780 744
Allstate Financial | Total life and annuity premiums                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 1,432 1,322 1,259
Allstate Financial | Interest-sensitive life insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 829 822 879
Allstate Financial | Fixed annuities                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 14 14 19
Allstate Financial | Total contract charges                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 843 836 898
Corporate and Other                      
Segment Reporting Information                      
Net investment income                 42 35 27
Realized capital gains and losses                 (3) 0 1
Service fees                 4 3 5
Total Corporate and Other before reclassification of service fees                 43 38 33
Reclassification of service fees                 (4) (3) (5)
Revenues                 $ 39 $ 35 $ 28