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Reporting Segments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information        
Property-liability insurance premiums $ 8,018 $ 7,814 $ 15,977 $ 15,537
Net investment income 897 762 1,645 1,493
Realized capital gains and losses 81 24 215 (125)
Life and annuity premiums and contract charges 591 564 1,184 1,130
Total revenues 9,587 9,164 19,021 18,035
Property-Liability        
Segment Reporting Information        
Property-liability insurance premiums 8,018 7,814 15,977 15,537
Net investment income 391 316 702 618
Realized capital gains and losses 85 26 220 (73)
Total revenues 8,494 8,156 16,899 16,082
Allstate Protection        
Segment Reporting Information        
Property-liability insurance premiums 8,018 7,814 15,977 15,537
Discontinued Lines and Coverages        
Segment Reporting Information        
Property-liability insurance premiums 0 0 0 0
Allstate Financial        
Segment Reporting Information        
Net investment income 496 435 922 854
Realized capital gains and losses (4) 0 (5) (49)
Life and annuity premiums and contract charges 591 564 1,184 1,130
Total revenues 1,083 999 2,101 1,935
Corporate and Other        
Segment Reporting Information        
Net investment income 10 11 21 21
Realized capital gains and losses 0 (2) 0 (3)
Total revenues 10 9 21 18
Auto | Property-Liability        
Segment Reporting Information        
Property-liability insurance premiums 5,437 5,306 10,825 10,526
Homeowners | Property-Liability        
Segment Reporting Information        
Property-liability insurance premiums 1,815 1,815 3,630 3,625
Other personal lines | Property-Liability        
Segment Reporting Information        
Property-liability insurance premiums 436 424 867 845
Commercial lines | Property-Liability        
Segment Reporting Information        
Property-liability insurance premiums 118 127 243 256
Other business lines | Property-Liability        
Segment Reporting Information        
Property-liability insurance premiums 142 142 283 285
SquareTrade | Property-Liability        
Segment Reporting Information        
Property-liability insurance premiums 70 0 129 0
Traditional life insurance | Allstate Financial        
Segment Reporting Information        
Life and annuity premiums and contract charges 148 139 297 277
Accident and health insurance | Allstate Financial        
Segment Reporting Information        
Life and annuity premiums and contract charges 233 214 465 430
Total life and annuity premiums | Allstate Financial        
Segment Reporting Information        
Life and annuity premiums and contract charges 381 353 762 707
Interest-sensitive life insurance | Allstate Financial        
Segment Reporting Information        
Life and annuity premiums and contract charges 207 208 416 417
Fixed annuities | Allstate Financial        
Segment Reporting Information        
Life and annuity premiums and contract charges 3 3 6 6
Total contract charges | Allstate Financial        
Segment Reporting Information        
Life and annuity premiums and contract charges $ 210 $ 211 $ 422 $ 423