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Reportable Segments - Revenue information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information
Net investment income	$ 824	$ 897	$ 1,610	$ 1,645
Realized capital gains and losses	(25)	81	(159)	215
Total revenues	10,099	9,813	19,869	19,457
Other revenue
Segment Reporting Information
Other revenue	228	226	444	436
Property-Liability
Segment Reporting Information
Net investment income	353	387	690	695
Operating Segments | Property-Liability
Segment Reporting Information
Other revenue	8,189	7,807	16,208	15,566
Net investment income	353	387	690	695
Realized capital gains and losses	(15)	85	(110)	220
Total revenues	8,711	8,460	17,146	16,829
Operating Segments | Property-Liability | Auto
Segment Reporting Information
Other revenue	5,705	5,438	11,296	10,826
Operating Segments | Property-Liability | Homeowners
Segment Reporting Information
Other revenue	1,864	1,815	3,712	3,630
Operating Segments | Property-Liability | Other personal lines
Segment Reporting Information
Other revenue	455	436	899	867
Operating Segments | Property-Liability | Commercial lines
Segment Reporting Information
Other revenue	165	118	301	243
Operating Segments | Property-Liability | Other revenue
Segment Reporting Information
Other revenue	184	181	358	348
Operating Segments | Allstate Protection
Segment Reporting Information
Other revenue	8,189	7,807	16,208	15,566
Operating Segments | Discontinued Lines and Coverages
Segment Reporting Information
Other revenue	0	0	0	0
Operating Segments | Service Businesses
Segment Reporting Information
Net investment income	6	4	11	7
Realized capital gains and losses	(2)	0	(6)	0
Intersegment premiums and service fees	29	28	58	56
Total revenues	320	260	633	507
Operating Segments | Service Businesses | Other revenue
Segment Reporting Information
Other revenue	16	17	32	33
Operating Segments | Service Businesses | Consumer product protection plans
Segment Reporting Information
Other revenue	121	70	244	129
Operating Segments | Service Businesses | Roadside assistance
Segment Reporting Information
Other revenue	68	67	132	135
Operating Segments | Service Businesses | Finance and insurance products
Segment Reporting Information
Other revenue	82	74	162	147
Operating Segments | Allstate Life
Segment Reporting Information
Net investment income	130	123	252	243
Realized capital gains and losses	(3)	1	(6)	2
Total revenues	481	471	953	940
Operating Segments | Allstate Life | Other revenue
Segment Reporting Information
Other revenue	28	28	54	55
Operating Segments | Allstate Life | Traditional life insurance premiums
Segment Reporting Information
Other revenue	148	139	294	279
Operating Segments | Allstate Life | Accident and health insurance premiums
Segment Reporting Information
Other revenue	1	1	1	1
Operating Segments | Allstate Life | Interest-sensitive life insurance contract charges
Segment Reporting Information
Other revenue	177	179	358	360
Operating Segments | Allstate Benefits
Segment Reporting Information
Net investment income	19	19	38	36
Realized capital gains and losses	0	0	(2)	0
Total revenues	302	288	605	574
Operating Segments | Allstate Benefits | Traditional life insurance premiums
Segment Reporting Information
Other revenue	10	9	19	18
Operating Segments | Allstate Benefits | Accident and health insurance premiums
Segment Reporting Information
Other revenue	245	232	493	464
Operating Segments | Allstate Benefits | Interest-sensitive life insurance contract charges
Segment Reporting Information
Other revenue	28	28	57	56
Operating Segments | Allstate Annuities
Segment Reporting Information
Net investment income	293	354	583	643
Realized capital gains and losses	6	(5)	(23)	(7)
Total revenues	302	352	566	642
Operating Segments | Allstate Annuities | Fixed annuities contract charges
Segment Reporting Information
Other revenue	3	3	6	6
Operating Segments | Corporate and Other
Segment Reporting Information
Net investment income	23	10	36	21
Realized capital gains and losses	(11)	0	(12)	0
Total revenues	12	10	24	21
Intersegment Eliminations
Segment Reporting Information
Total revenues	$ (29)	$ (28)	$ (58)	$ (56)

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