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Reporting Segments (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Schedule of business segments revenue disclosures |
Reportable segments revenue information
|  | For the years ended December 31,
($ in millions) |  | 2017 |  | 2016 |  | 2015
Property-Liability |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |
Auto |  | $ | 21,878 |  |  | $ | 21,264 |  |  | $ | 20,410 |
Homeowners |  | 7,310 |  |  | 7,257 |  |  | 7,136 |
Other personal lines |  | 1,750 |  |  | 1,700 |  |  | 1,692 |
Commercial lines |  | 495 |  |  | 506 |  |  | 510 |
Allstate Protection |  | 31,433 |  |  | 30,727 |  |  | 29,748 |
Discontinued Lines and Coverages |  | — |  |  | — |  |  | — |
Total property-liability 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 Property-Liability |  | 33,312 |  |  | 31,974 |  |  | 30,737 |
Service Businesses |  |  |  |  |  |
Consumer product protection plans |  | 295 |  |  | — |  |  | — |
Roadside assistance |  | 268 |  |  | 310 |  |  | 340 |
Finance and insurance products |  | 304 |  |  | 270 |  |  | 221 |
Intersegment premiums and service fees (1) |  | 110 |  |  | 105 |  |  | 42 |
Net investment income |  | 16 |  |  | 13 |  |  | 11 |
Total Service Businesses |  | 993 |  |  | 698 |  |  | 614 |
Allstate Life |  |  |  |  |  |
Traditional life insurance premiums |  | 568 |  |  | 533 |  |  | 505 |
Accident and health insurance premiums |  | 2 |  |  | 2 |  |  | 2 |
Interest-sensitive life insurance contract charges |  | 710 |  |  | 715 |  |  | 716 |
Net investment income |  | 489 |  |  | 482 |  |  | 490 |
Realized capital gains and losses |  | 5 |  |  | (38 | ) |  | 2 |
Total Allstate Life |  | 1,774 |  |  | 1,694 |  |  | 1,715 |
Allstate Benefits |  |  |  |  |  |
Traditional life insurance premiums |  | 42 |  |  | 40 |  |  | 37 |
Accident and health insurance premiums |  | 928 |  |  | 857 |  |  | 778 |
Interest-sensitive life insurance contract charges |  | 114 |  |  | 114 |  |  | 106 |
Net investment income |  | 72 |  |  | 71 |  |  | 71 |
Realized capital gains and losses |  | 1 |  |  | (5 | ) |  | 1 |
Total Allstate Benefits |  | 1,157 |  |  | 1,077 |  |  | 993 |
Allstate Annuities |  |  |  |  |  |
Fixed annuities contract charges |  | 14 |  |  | 14 |  |  | 14 |
Net investment income |  | 1,305 |  |  | 1,181 |  |  | 1,323 |
Realized capital gains and losses |  | 44 |  |  | (38 | ) |  | 264 |
Total Allstate Annuities |  | 1,363 |  |  | 1,157 |  |  | 1,601 |
Corporate and Other |  |  |  |  |  |
Net investment income |  | 41 |  |  | 42 |  |  | 35 |
Realized capital gains and losses |  | (6 | ) |  | (3 | ) |  | — |
Total Corporate and Other |  | 35 |  |  | 39 |  |  | 35 |
Intersegment eliminations (1) |  | (110 | ) |  | (105 | ) |  | (42 | )
Consolidated revenues |  | $ | 38,524 |  |  | $ | 36,534 |  |  | $ | 35,653 |
(1) Intersegment insurance premiums and service fees are primarily related to Arity and Allstate Roadside Services and are eliminated in the consolidated financial statements.
Schedule of business segments net income disclosures |
Reportable segments financial performance
|  | For the years ended December 31,
($ in millions) |  | 2017 |  | 2016 |  | 2015
Property-Liability |  |  |  |  |  |
Allstate Protection |  | $ | 2,111 |  |  | $ | 1,327 |  |  | $ | 1,621 |
Discontinued Lines and Coverages |  | (99 | ) |  | (107 | ) |  | (55 | )
Total underwriting income |  | 2,012 |  |  | 1,220 |  |  | 1,566 |
Net investment income |  | 1,478 |  |  | 1,253 |  |  | 1,226 |
Income tax expense on operations |  | (1,119 | ) |  | (812 | ) |  | (922 | )
Realized capital gains and losses, after-tax |  | 272 |  |  | — |  |  | (154 | )
Gain on disposition of operations, after-tax |  | 9 |  |  | — |  |  | — |
Change in accounting for investments in qualified affordable housing projects |  | — |  |  | — |  |  | (28 | )
Tax Legislation expense |  | (65 | ) |  | — |  |  | — |
Property-Liability net income applicable to common shareholders |  | 2,587 |  |  | 1,661 |  |  | 1,688 |
Service Businesses |  |  |  |  |  |
Adjusted net (loss) income |  | (59 | ) |  | 3 |  |  | 2 |
Amortization of purchased intangible assets, after-tax |  | (60 | ) |  | — |  |  | — |
Tax Legislation benefit |  | 134 |  |  | — |  |  | — |
Service Businesses net income applicable to common shareholders |  | 15 |  |  | 3 |  |  | 2 |
Allstate Life |  |  |  |  |  |
Adjusted net income |  | 253 |  |  | 247 |  |  | 239 |
Realized capital gains and losses, after-tax |  | 2 |  |  | (24 | ) |  | 1 |
DAC and DSI amortization related to realized capital gains and losses, after-tax |  | (10 | ) |  | (4 | ) |  | (4 | )
Loss on disposition of operations, after-tax |  | — |  |  | — |  |  | (1 | )
Change in accounting for investments in qualified affordable housing projects |  | — |  |  | — |  |  | (6 | )
Tax Legislation benefit |  | 332 |  |  | — |  |  | — |
Allstate Life net income applicable to common shareholders |  | 577 |  |  | 219 |  |  | 229 |
Allstate Benefits |  |  |  |  |  |
Adjusted net income |  | 95 |  |  | 100 |  |  | 104 |
Realized capital gains and losses, after-tax |  | — |  |  | (4 | ) |  | — |
Tax Legislation benefit |  | 51 |  |  | — |  |  | — |
Allstate Benefits net income applicable to common shareholders |  | 146 |  |  | 96 |  |  | 104 |
Allstate Annuities |  |  |  |  |  |
Adjusted net income |  | 204 |  |  | 101 |  |  | 166 |
Realized capital gains and losses, after-tax |  | 28 |  |  | (26 | ) |  | 172 |
Valuation changes on embedded derivatives not hedged, after-tax |  | — |  |  | (2 | ) |  | (1 | )
DAC and DSI amortization related to realized capital gains and losses and valuation changes on embedded derivatives not hedged, after-tax |  | — |  |  | — |  |  | 1 |
Gain on disposition of operations, after-tax |  | 4 |  |  | 3 |  |  | 3 |
Change in accounting for investments in qualified affordable housing projects |  | — |  |  | — |  |  | (11 | )
Tax Legislation benefit |  | 182 |  |  | — |  |  | — |
Allstate Annuities net income applicable to common shareholders |  | 418 |  |  | 76 |  |  | 330 |
Corporate and Other |  |  |  |  |  |
Adjusted net loss |  | (399 | ) |  | (292 | ) |  | (298 | )
Realized capital gains and losses, after-tax |  | (4 | ) |  | (2 | ) |  | — |
Goodwill impairment |  | (125 | ) |  | — |  |  | — |
Business combination expenses, after-tax |  | (14 | ) |  | — |  |  | — |
Tax Legislation expense |  | (128 | ) |  | — |  |  | — |
Corporate and Other net loss applicable to common shareholders |  | (670 | ) |  | (294 | ) |  | (298 | )
Consolidated net income applicable to common shareholders |  | $ | 3,073 |  |  | $ | 1,761 |  |  | $ | 2,055 |
Additional significant financial performance data |  |  |  |  |  |
|  | For the years ended December 31,
($ in millions) |  | 2017 |  | 2016 |  | 2015
Amortization of DAC |  |  |  |  |  |
Property-Liability |  | $ | 4,205 |  |  | $ | 4,053 |  |  | $ | 3,933 |
Service Businesses |  | 296 |  |  | 214 |  |  | 169 |
Allstate Life |  | 134 |  |  | 131 |  |  | 133 |
Allstate Benefits |  | 142 |  |  | 145 |  |  | 124 |
Allstate Annuities |  | 7 |  |  | 7 |  |  | 5 |
Consolidated |  | $ | 4,784 |  |  | $ | 4,550 |  |  | $ | 4,364 |
​ |  | ​ |  | ​ |  | ​
Income tax expense (benefit) |  |  |  |  |  |
Property-Liability |  | $ | 1,318 |  |  | $ | 806 |  |  | $ | 867 |
Service Businesses |  | (193 | ) |  | — |  |  | 2 |
Allstate Life |  | (224 | ) |  | 91 |  |  | 108 |
Allstate Benefits |  | 1 |  |  | 51 |  |  | 55 |
Allstate Annuities |  | (58 | ) |  | 36 |  |  | 188 |
Corporate and Other |  | (42 | ) |  | (107 | ) |  | (109 | )
Consolidated |  | $ | 802 |  |  | $ | 877 |  |  | $ | 1,111 |
Impacts of Tax Legislation |  |  |  |  |  |
|  | For the year ended December 31, 2017
($ in millions) |  | Income tax expense (benefit) before Tax Legislation |  | Tax Legislation expense (benefit) |  | Income tax expense (benefit) after Tax Legislation
Income tax expense (benefit) |  |  |  |  |  |
Property-Liability |  | $ | 1,253 |  |  | $ | 65 |  |  | $ | 1,318 |
Service Businesses |  | (59 | ) |  | (134 | ) |  | (193 | )
Allstate Life |  | 108 |  |  | (332 | ) |  | (224 | )
Allstate Benefits |  | 52 |  |  | (51 | ) |  | 1 |
Allstate Annuities |  | 124 |  |  | (182 | ) |  | (58 | )
Corporate and Other |  | (170 | ) |  | 128 |  |  | (42 | )
Consolidated |  | $ | 1,308 |  |  | $ | (506 | ) |  | $ | 802 |
Additional significant financial performance data |
Additional significant financial performance data |  |  |  |  |  |
|  | For the years ended December 31,
($ in millions) |  | 2017 |  | 2016 |  | 2015
Amortization of DAC |  |  |  |  |  |
Property-Liability |  | $ | 4,205 |  |  | $ | 4,053 |  |  | $ | 3,933 |
Service Businesses |  | 296 |  |  | 214 |  |  | 169 |
Allstate Life |  | 134 |  |  | 131 |  |  | 133 |
Allstate Benefits |  | 142 |  |  | 145 |  |  | 124 |
Allstate Annuities |  | 7 |  |  | 7 |  |  | 5 |
Consolidated |  | $ | 4,784 |  |  | $ | 4,550 |  |  | $ | 4,364 |
​ |  | ​ |  | ​ |  | ​
Income tax expense (benefit) |  |  |  |  |  |
Property-Liability |  | $ | 1,318 |  |  | $ | 806 |  |  | $ | 867 |
Service Businesses |  | (193 | ) |  | — |  |  | 2 |
Allstate Life |  | (224 | ) |  | 91 |  |  | 108 |
Allstate Benefits |  | 1 |  |  | 51 |  |  | 55 |
Allstate Annuities |  | (58 | ) |  | 36 |  |  | 188 |
Corporate and Other |  | (42 | ) |  | (107 | ) |  | (109 | )
Consolidated |  | $ | 802 |  |  | $ | 877 |  |  | $ | 1,111 |
Impacts of Tax Legislation |  |  |  |  |  |
|  | For the year ended December 31, 2017
($ in millions) |  | Income tax expense (benefit) before Tax Legislation |  | Tax Legislation expense (benefit) |  | Income tax expense (benefit) after Tax Legislation
Income tax expense (benefit) |  |  |  |  |  |
Property-Liability |  | $ | 1,253 |  |  | $ | 65 |  |  | $ | 1,318 |
Service Businesses |  | (59 | ) |  | (134 | ) |  | (193 | )
Allstate Life |  | 108 |  |  | (332 | ) |  | (224 | )
Allstate Benefits |  | 52 |  |  | (51 | ) |  | 1 |
Allstate Annuities |  | 124 |  |  | (182 | ) |  | (58 | )
Corporate and Other |  | (170 | ) |  | 128 |  |  | (42 | )
Consolidated |  | $ | 1,308 |  |  | $ | (506 | ) |  | $ | 802 |
Summarized data for total assets and investments |
Reportable segment total assets and investments as of December 31, 2017 (1) |  |
($ in millions) |  |
Assets (2) |  |
Property-Liability |  | $ | 60,197 |
Service Businesses |  | 4,531 |
Allstate Life |  | 14,107 |
Allstate Benefits |  | 2,766 |
Allstate Annuities |  | 28,836 |
Corporate and Other |  | 1,985 |
Consolidated |  | $ | 112,422 |
​ |  | ​
Investments (3) |  |
Property-Liability |  | $ | 43,183 |
Service Businesses |  | 954 |
Allstate Life |  | 11,210 |
Allstate Benefits |  | 1,776 |
Allstate Annuities |  | 23,722 |
Corporate and Other |  | 1,958 |
Consolidated |  | $ | 82,803 |
(1) | The balances above reflect the elimination of related party investments between segments.
(2) | Due to the changes in reportable segments, prior year total assets are not available for the new segments as it was impracticable to calculate. Total assets for previously reported Property-Liability, Allstate Financial, and Corporate and Other segments were $60.39 billion, $45.95 billion and $2.27 billion as of December 31, 2016, respectively, and $55.67 billion, $46.34 billion and $2.64 billion as of December 31, 2015, respectively.
(3) | Due to the changes in reportable segments, prior year investments balances are not available for the new segments as it was impracticable to calculate. Total investments for previously reported Property-Liability, Allstate Financial, and Corporate and Other segments were $42.72 billion, $36.84 billion and $2.24 billion as of December 31, 2016, respectively, and $38.48 billion, $36.79 billion and $2.49 billion as of December 31, 2015, respectively.

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