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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | $ 8,121 | $ 7,869 | $ 24,098 | $ 23,406
Net investment income | 843 | 748 | 2,488 | 2,241
Realized capital gains and losses | 103 | 33 | 318 | (92)
Life and annuity premiums and contract charges | 593 | 571 | 1,777 | 1,701
Total revenues | 9,660 | 9,221 | 28,681 | 27,256
Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 8,121 | 7,869 | 24,098 | 23,406
Net investment income | 372 | 310 | 1,074 | 928
Realized capital gains and losses | 82 | 53 | 302 | (20)
Total revenues | 8,575 | 8,232 | 25,474 | 24,314
Allstate Protection |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 8,121 | 7,869 | 24,098 | 23,406
Discontinued Lines and Coverages |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 0 | 0 | 0 | 0
Allstate Financial |  |  |  |
Segment Reporting Information |  |  |  |
Net investment income | 461 | 427 | 1,383 | 1,281
Realized capital gains and losses | 21 | (21) | 16 | (70)
Life and annuity premiums and contract charges | 593 | 571 | 1,777 | 1,701
Total revenues | 1,075 | 977 | 3,176 | 2,912
Corporate and Other |  |  |  |
Segment Reporting Information |  |  |  |
Net investment income | 10 | 11 | 31 | 32
Realized capital gains and losses | 0 | 1 | 0 | (2)
Total revenues | 10 | 12 | 31 | 30
Auto | Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 5,502 | 5,353 | 16,327 | 15,879
Homeowners | Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 1,832 | 1,813 | 5,462 | 5,438
Other personal lines | Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 439 | 426 | 1,306 | 1,271
Commercial lines | Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 124 | 127 | 367 | 383
Other business lines | Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 146 | 150 | 429 | 435
SquareTrade | Property-Liability |  |  |  |
Segment Reporting Information |  |  |  |
Property-liability insurance premiums | 78 | 0 | 207 | 0
Traditional life insurance | Allstate Financial |  |  |  |
Segment Reporting Information |  |  |  |
Life and annuity premiums and contract charges | 153 | 145 | 450 | 422
Accident and health insurance | Allstate Financial |  |  |  |
Segment Reporting Information |  |  |  |
Life and annuity premiums and contract charges | 232 | 216 | 697 | 646
Total life and annuity premiums | Allstate Financial |  |  |  |
Segment Reporting Information |  |  |  |
Life and annuity premiums and contract charges | 385 | 361 | 1,147 | 1,068
Interest-sensitive life insurance | Allstate Financial |  |  |  |
Segment Reporting Information |  |  |  |
Life and annuity premiums and contract charges | 204 | 206 | 620 | 623
Fixed annuities | Allstate Financial |  |  |  |
Segment Reporting Information |  |  |  |
Life and annuity premiums and contract charges | 4 | 4 | 10 | 10
Total contract charges | Allstate Financial |  |  |  |
Segment Reporting Information |  |  |  |
Life and annuity premiums and contract charges | $ 208 | $ 210 | $ 630 | $ 633

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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 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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