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Reportable Segments (Tables) | 3 Months Ended
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Mar. 31, 2021
Segment Reporting [Abstract] |
Schedule of business segments net income disclosures |
Reportable segments financial performance |  |  |  |
|  | Three months ended March 31, |  |
($ in millions) |  | 2021 |  | 2020 |  |  |  |
Underwriting income (loss) by segment |  |  |  |  |  |  |  |
Allstate Protection |  | $ | 1,660 |  |  | $ | 1,351 |  |  |  |  |
Run-off Property-Liability |  | (3) |  |  | (3) |  |  |  |  |
Adjusted net income (loss) by segment, after-tax |  |  |  |  |  |  |  |
Protection Services |  | 49 |  |  | 37 |  |  |  |  |
Allstate Health and Benefits |  | 65 |  |  | 24 |  |  |  |  |
Corporate and Other |  | (123) |  |  | (107) |  |  |  |  |
Reconciling items |  |  |  |  |  |  |  |
Property-Liability net investment income |  | 673 |  |  | 202 |  |  |  |  |
Realized capital gains (losses) |  | 426 |  |  | (162) |  |  |  |  |
Pension and other postretirement remeasurement gains (losses) |  | 310 |  |  | (318) |  |  |  |  |
Business combination expenses and amortization of purchased intangibles |  | (56) |  |  | (27) |  |  |  |  |
Income tax expense on reconciling items |  | (622) |  |  | (196) |  |  |  |  |
Total reconciling items |  | 731 |  |  | (501) |  |  |  |  |
Loss from discontinued operations |  | (4,163) |  |  | (370) |  |  |  |  |
Income tax benefit from discontinued operations |  | 370 |  |  | 82 |  |  |  |  |
Total from discontinued operations |  | $ | (3,793) |  |  | $ | (288) |  |  |  |  |
Less: Net loss attributable to noncontrolling interest |  | (6) |  |  | — |  |  |  |  |
Net (loss) income applicable to common shareholders |  | $ | (1,408) |  |  | $ | 513 |  |  |  |  |
Schedule of business segments revenue disclosures |
Reportable segments revenue information |  |  |  |
($ in millions) |  | Three months ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Property-Liability |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |
Auto |  | $ | 6,809 |  |  | $ | 6,155 |  |  |  |  |
Homeowners |  | 2,392 |  |  | 2,037 |  |  |  |  |
Other personal lines |  | 505 |  |  | 471 |  |  |  |  |
Commercial lines |  | 190 |  |  | 218 |  |  |  |  |
Allstate Protection |  | 9,896 |  |  | 8,881 |  |  |  |  |
Run-off Property-Liability |  | — |  |  | — |  |  |  |  |
Total Property-Liability insurance premiums |  | 9,896 |  |  | 8,881 |  |  |  |  |
Other revenue |  | 385 |  |  | 213 |  |  |  |  |
Net investment income |  | 673 |  |  | 202 |  |  |  |  |
Realized capital gains (losses) |  | 404 |  |  | (103) |  |  |  |  |
Total Property-Liability |  | 11,358 |  |  | 9,193 |  |  |  |  |
Protection Services |  |  |  |  |  |  |  |
Protection plans |  | 260 |  |  | 206 |  |  |  |  |
Roadside assistance |  | 47 |  |  | 51 |  |  |  |  |
Finance and insurance products |  | 104 |  |  | 97 |  |  |  |  |
Intersegment premiums and service fees (1) |  | 41 |  |  | 38 |  |  |  |  |
Other revenue (2) |  | 90 |  |  | 52 |  |  |  |  |
Net investment income |  | 10 |  |  | 10 |  |  |  |  |
Realized capital gains (losses) |  | 10 |  |  | (24) |  |  |  |  |
Total Protection Services |  | 562 |  |  | 430 |  |  |  |  |
Allstate Health and Benefits |  |  |  |  |  |  |  |
Employer voluntary benefits |  | 263 |  |  | 282 |  |  |  |  |
Group health |  | 83 |  |  | — |  |  |  |  |
Individual accident and health |  | 109 |  |  | — |  |  |  |  |
Other revenue |  | 80 |  |  | — |  |  |  |  |
Net investment income |  | 19 |  |  | 20 |  |  |  |  |
Realized capital gains (losses) |  | 2 |  |  | (14) |  |  |  |  |
Total Allstate Health and Benefits |  | 556 |  |  | 288 |  |  |  |  |
Corporate and Other |  |  |  |  |  |  |  |
Net investment income |  | 6 |  |  | 14 |  |  |  |  |
Realized capital gains (losses) |  | 10 |  |  | (21) |  |  |  |  |
Total Corporate and Other |  | 16 |  |  | (7) |  |  |  |  |
Intersegment eliminations (1) |  | (41) |  |  | (38) |  |  |  |  |
Consolidated revenues |  | $ | 12,451 |  |  | $ | 9,866 |  |  |  |  |
(1)Intersegment insurance premiums and service fees are primarily related to Arity and Allstate Roadside and are eliminated in the condensed consolidated financial statements. (2)Other revenue is primarily related to Arity, Allstate Identity Protection, Allstate Dealer Services, and Allstate Protection Plans.

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