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Reporting Segments - Reportable segments revenue information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  | $ 32,300 | $ 31,307 | $ 30,309
Life and annuity premiums and contract charges |  |  |  |  |  |  |  |  | 2,378 | 2,275 | 2,158
Net investment income |  |  |  |  |  |  |  |  | 3,401 | 3,042 | 3,156
Realized capital gains and losses |  |  |  |  |  |  |  |  | 445 | (90) | 30
Total revenues | $ 9,843 | $ 9,660 | $ 9,587 | $ 9,434 | $ 9,278 | $ 9,221 | $ 9,164 | $ 8,871 | 38,524 | 36,534 | 35,653
Allstate Protection |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  | 31,433 | 30,727 | 29,748
Discontinued Lines and Coverages |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  | 0 | 0 | 0
Property-Liability |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  | 31,433 | 30,727 | 29,748
Net investment income |  |  |  |  |  |  |  |  | 1,478 | 1,253 | 1,226
Realized capital gains and losses |  |  |  |  |  |  |  |  | 401 | (6) | (237)
Total revenues |  |  |  |  |  |  |  |  | 33,312 | 31,974 | 30,737
Property-Liability | Auto |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  | 21,878 | 21,264 | 20,410
Property-Liability | Homeowners |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  | 7,310 | 7,257 | 7,136
Property-Liability | Other personal lines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  | 1,750 | 1,700 | 1,692
Property-Liability | Commercial lines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  | 495 | 506 | 510
Service Businesses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Intersegment premiums and service fees (1) |  |  |  |  |  |  |  |  | 110 | 105 | 42
Net investment income |  |  |  |  |  |  |  |  | 16 | 13 | 11
Total revenues |  |  |  |  |  |  |  |  | 993 | 698 | 614
Service Businesses | Consumer product protection plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 295 | 0 | 0
Service Businesses | Roadside assistance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 268 | 310 | 340
Service Businesses | Finance and insurance products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 304 | 270 | 221
Allstate Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 489 | 482 | 490
Realized capital gains and losses |  |  |  |  |  |  |  |  | 5 | (38) | 2
Total revenues |  |  |  |  |  |  |  |  | 1,774 | 1,694 | 1,715
Allstate Life | Traditional life insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Life and annuity premiums and contract charges |  |  |  |  |  |  |  |  | 568 | 533 | 505
Allstate Life | Accident and health insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Life and annuity premiums and contract charges |  |  |  |  |  |  |  |  | 2 | 2 | 2
Allstate Life | Interest-sensitive life insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Life and annuity premiums and contract charges |  |  |  |  |  |  |  |  | 710 | 715 | 716
Allstate Benefits |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 72 | 71 | 71
Realized capital gains and losses |  |  |  |  |  |  |  |  | 1 | (5) | 1
Total revenues |  |  |  |  |  |  |  |  | 1,157 | 1,077 | 993
Allstate Benefits | Traditional life insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Life and annuity premiums and contract charges |  |  |  |  |  |  |  |  | 42 | 40 | 37
Allstate Benefits | Accident and health insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Life and annuity premiums and contract charges |  |  |  |  |  |  |  |  | 928 | 857 | 778
Allstate Benefits | Interest-sensitive life insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Life and annuity premiums and contract charges |  |  |  |  |  |  |  |  | 114 | 114 | 106
Allstate Annuities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1,305 | 1,181 | 1,323
Realized capital gains and losses |  |  |  |  |  |  |  |  | 44 | (38) | 264
Total revenues |  |  |  |  |  |  |  |  | 1,363 | 1,157 | 1,601
Allstate Annuities | Fixed annuities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Life and annuity premiums and contract charges |  |  |  |  |  |  |  |  | 14 | 14 | 14
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 41 | 42 | 35
Realized capital gains and losses |  |  |  |  |  |  |  |  | (6) | (3) | 0
Total revenues |  |  |  |  |  |  |  |  | 35 | 39 | 35
Intersegment Eliminations (2) |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ (110) | $ (105) | $ (42)

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- Definition Premiums recognized as revenue in the period on all life insurance and reinsurance contracts, as well as accident and health insurance and reinsurance contracts, after subtracting any amounts ceded to another insurer. Also includes an amount that an insurer adds to a policy's premium, or deducts from a policy's cash value or contract holder's account, as compensation for services rendered (may include fees), after subtracting any amounts ceded to another insurer. + References No definition available. + Details
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- Definition Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of property and casualty premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167274&loc=d3e27175-158546 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031664&loc=d3e22529-158502 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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