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Reporting Segments - Reportable segments revenue information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | $ 38,577 | $ 36,513 | $ 34,678
Net investment income |  |  |  |  |  |  |  |  | 3,159 | 3,240 | 3,401
Realized capital gains and losses |  |  |  |  |  |  |  |  | 1,885 | (877) | 445
Total revenues | $ 11,472 | $ 11,069 | $ 11,144 | $ 10,990 | $ 9,481 | $ 10,465 | $ 10,099 | $ 9,770 | 44,675 | 39,815 | 39,407
Allstate Protection |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 34,843 | 32,950 | 31,433
Discontinued Lines and Coverages |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 0 | 0 | 0
Property-Liability |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 34,843 | 32,950 | 31,433
Net investment income |  |  |  |  |  |  |  |  | 1,533 | 1,464 | 1,478
Realized capital gains and losses |  |  |  |  |  |  |  |  | 1,470 | (639) | 401
Total revenues |  |  |  |  |  |  |  |  | 38,587 | 34,513 | 34,015
Property-Liability | Auto |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 24,188 | 22,970 | 21,878
Property-Liability | Homeowners |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 7,912 | 7,517 | 7,310
Property-Liability | Other personal lines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 1,861 | 1,808 | 1,750
Property-Liability | Commercial lines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 882 | 655 | 495
Service Businesses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Intersegment premiums and service fees |  |  |  |  |  |  |  |  | 154 | 122 | 110
Net investment income |  |  |  |  |  |  |  |  | 42 | 27 | 16
Realized capital gains and losses |  |  |  |  |  |  |  |  | 32 | (11) | 0
Total revenues |  |  |  |  |  |  |  |  | 1,649 | 1,318 | 1,059
Service Businesses | Consumer product protection plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 633 | 503 | 295
Service Businesses | Roadside assistance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 238 | 263 | 268
Service Businesses | Finance and insurance products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 362 | 332 | 304
Allstate Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 514 | 505 | 489
Realized capital gains and losses |  |  |  |  |  |  |  |  | 1 | (14) | 5
Total revenues |  |  |  |  |  |  |  |  | 1,983 | 1,925 | 1,888
Allstate Life | Traditional life insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 630 | 600 | 568
Allstate Life | Accident and health insurance premiums |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 2 | 2 | 2
Allstate Life | Interest-sensitive life insurance contract charges |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 711 | 713 | 710
Allstate Benefits |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 83 | 77 | 72
Realized capital gains and losses |  |  |  |  |  |  |  |  | 12 | (9) | 1
Total revenues |  |  |  |  |  |  |  |  | 1,240 | 1,203 | 1,157
Allstate Benefits | Traditional life insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 43 | 44 | 42
Allstate Benefits | Accident and health insurance premiums |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 988 | 980 | 928
Allstate Benefits | Interest-sensitive life insurance contract charges |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 114 | 111 | 114
Allstate Annuities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 917 | 1,096 | 1,305
Realized capital gains and losses |  |  |  |  |  |  |  |  | 346 | (166) | 44
Total revenues |  |  |  |  |  |  |  |  | 1,276 | 945 | 1,363
Allstate Annuities | Fixed annuities contract charges |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 13 | 15 | 14
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 70 | 71 | 41
Realized capital gains and losses |  |  |  |  |  |  |  |  | 24 | (38) | (6)
Total revenues |  |  |  |  |  |  |  |  | 94 | 33 | 35
Operating Segments | Property-Liability |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 741 | 738 | 703
Operating Segments | Service Businesses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 188 | 82 | 66
Operating Segments | Allstate Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Insurance commissions and fees |  |  |  |  |  |  |  |  | 125 | 119 | 114
Intersegment eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ (154) | $ (122) | $ (110)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c),(d)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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