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Reportable Segments (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Schedule of business segments revenue disclosures |
Reportable segments revenue information |  |  |  |
($ in millions) |  | Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Property-Liability |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums |  |  |  |  |  |  |  |  |  |  |  |
Auto |  | $ | 5,705 |  |  | $ | 5,438 |  |  | $ | 11,296 |  |  | $ | 10,826 |
Homeowners |  | 1,864 |  |  | 1,815 |  |  | 3,712 |  |  | 3,630 |
Other personal lines |  | 455 |  |  | 436 |  |  | 899 |  |  | 867 |
Commercial lines |  | 165 |  |  | 118 |  |  | 301 |  |  | 243 |
Allstate Protection |  | 8,189 |  |  | 7,807 |  |  | 16,208 |  |  | 15,566 |
Discontinued Lines and Coverages |  | — |  |  | — |  |  | — |  |  | — |
Total property-liability insurance premiums |  | 8,189 |  |  | 7,807 |  |  | 16,208 |  |  | 15,566 |
Other revenue |  | 184 |  |  | 181 |  |  | 358 |  |  | 348 |
Net investment income |  | 353 |  |  | 387 |  |  | 690 |  |  | 695 |
Realized capital gains and losses |  | (15 | ) |  | 85 |  |  | (110 | ) |  | 220 |
Total Property-Liability |  | 8,711 |  |  | 8,460 |  |  | 17,146 |  |  | 16,829 |
Service Businesses |  |  |  |  |  |  |  |  |  |
Consumer product protection plans |  | 121 |  |  | 70 |  |  | 244 |  |  | 129 |
Roadside assistance |  | 68 |  |  | 67 |  |  | 132 |  |  | 135 |
Finance and insurance products |  | 82 |  |  | 74 |  |  | 162 |  |  | 147 |
Intersegment premiums and service fees (1) |  | 29 |  |  | 28 |  |  | 58 |  |  | 56 |
Other revenue |  | 16 |  |  | 17 |  |  | 32 |  |  | 33 |
Net investment income |  | 6 |  |  | 4 |  |  | 11 |  |  | 7 |
Realized capital gains and losses |  | (2 | ) |  | — |  |  | (6 | ) |  | — |
Total Service Businesses |  | 320 |  |  | 260 |  |  | 633 |  |  | 507 |
Allstate Life |  |  |  |  |  |  |  |
Traditional life insurance premiums |  | 148 |  |  | 139 |  |  | 294 |  |  | 279 |
Accident and health insurance premiums |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |
Interest-sensitive life insurance contract charges |  | 177 |  |  | 179 |  |  | 358 |  |  | 360 |
Other revenue |  | 28 |  |  | 28 |  |  | 54 |  |  | 55 |
Net investment income |  | 130 |  |  | 123 |  |  | 252 |  |  | 243 |
Realized capital gains and losses |  | (3 | ) |  | 1 |  |  | (6 | ) |  | 2 |
Total Allstate Life |  | 481 |  |  | 471 |  |  | 953 |  |  | 940 |
Allstate Benefits |  |  |  |  |  |  |  |
Traditional life insurance premiums |  | 10 |  |  | 9 |  |  | 19 |  |  | 18 |
Accident and health insurance premiums |  | 245 |  |  | 232 |  |  | 493 |  |  | 464 |
Interest-sensitive life insurance contract charges |  | 28 |  |  | 28 |  |  | 57 |  |  | 56 |
Net investment income |  | 19 |  |  | 19 |  |  | 38 |  |  | 36 |
Realized capital gains and losses |  | — |  |  | — |  |  | (2 | ) |  | — |
Total Allstate Benefits |  | 302 |  |  | 288 |  |  | 605 |  |  | 574 |
Allstate Annuities |  |  |  |  |  |  |  |
Fixed annuities contract charges |  | 3 |  |  | 3 |  |  | 6 |  |  | 6 |
Net investment income |  | 293 |  |  | 354 |  |  | 583 |  |  | 643 |
Realized capital gains and losses |  | 6 |  |  | (5 | ) |  | (23 | ) |  | (7 | )
Total Allstate Annuities |  | 302 |  |  | 352 |  |  | 566 |  |  | 642 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  | 23 |  |  | 10 |  |  | 36 |  |  | 21 |
Realized capital gains and losses |  | (11 | ) |  | — |  |  | (12 | ) |  | — |
Total Corporate and Other |  | 12 |  |  | 10 |  |  | 24 |  |  | 21 |
Intersegment eliminations (1) |  | (29 | ) |  | (28 | ) |  | (58 | ) |  | (56 | )
Consolidated revenues |  | $ | 10,099 |  |  | $ | 9,813 |  |  | $ | 19,869 |  |  | $ | 19,457 |
(1) Intersegment insurance premiums and service fees are primarily related to Arity and Allstate Roadside Services and are eliminated in the condensed consolidated financial statements.
Schedule of business segments net income disclosures |
Reportable segments financial performance |  |  |  |
|  | Three months ended June 30, |  | Six months ended June 30,
($ in millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Property-Liability |  |  |  |  |  |  |  |
Allstate Protection |  | $ | 419 |  |  | $ | 270 |  |  | $ | 1,381 |  |  | $ | 820 |
Discontinued Lines and Coverages |  | (3 | ) |  | (5 | ) |  | (6 | ) |  | (7 | )
Total underwriting income |  | 416 |  |  | 265 |  |  | 1,375 |  |  | 813 |
Net investment income |  | 353 |  |  | 387 |  |  | 690 |  |  | 695 |
Income tax expense on operations |  | (157 | ) |  | (207 | ) |  | (425 | ) |  | (475 | )
Realized capital gains and losses, after-tax |  | (12 | ) |  | 56 |  |  | (87 | ) |  | 145 |
Gain on disposition of operations, after-tax |  | — |  |  | 6 |  |  | — |  |  | 6 |
Property-Liability net income applicable to common shareholders |  | 600 |  |  | 507 |  |  | 1,553 |  |  | 1,184 |
Service Businesses |  |  |  |  |  |  |  |
Adjusted net income (loss) |  | 1 |  |  | (8 | ) |  | (4 | ) |  | (18 | )
Realized capital gains and losses, after-tax |  | (1 | ) |  | — |  |  | (4 | ) |  | — |
Amortization of purchased intangible assets, after-tax |  | (16 | ) |  | (15 | ) |  | (32 | ) |  | (30 | )
Service Businesses net loss applicable to common shareholders |  | (16 | ) |  | (23 | ) |  | (40 | ) |  | (48 | )
Allstate Life |  |  |  |  |  |  |  |
Adjusted net income |  | 78 |  |  | 63 |  |  | 147 |  |  | 122 |
Realized capital gains and losses, after-tax |  | (2 | ) |  | — |  |  | (4 | ) |  | 1 |
DAC and DSI amortization related to realized capital gains and losses, after-tax |  | (3 | ) |  | (3 | ) |  | (5 | ) |  | (6 | )
Allstate Life net income applicable to common shareholders |  | 73 |  |  | 60 |  |  | 138 |  |  | 117 |
Allstate Benefits |  |  |  |  |  |  |  |
Adjusted net income |  | 34 |  |  | 25 |  |  | 62 |  |  | 47 |
Realized capital gains and losses, after-tax |  | — |  |  | — |  |  | (2 | ) |  | — |
Allstate Benefits net income applicable to common shareholders |  | 34 |  |  | 25 |  |  | 60 |  |  | 47 |
Allstate Annuities |  |  |  |  |  |  |  |
Adjusted net income |  | 44 |  |  | 65 |  |  | 79 |  |  | 94 |
Realized capital gains and losses, after-tax |  | 5 |  |  | (3 | ) |  | (18 | ) |  | (5 | )
Valuation changes on embedded derivatives not hedged, after-tax |  | — |  |  | (1 | ) |  | 4 |  |  | (1 | )
Gain on disposition of operations, after-tax |  | 1 |  |  | — |  |  | 2 |  |  | 2 |
Allstate Annuities net income applicable to common shareholders |  | 50 |  |  | 61 |  |  | 67 |  |  | 90 |
Corporate and Other |  |  |  |  |  |  |  |
Adjusted net loss |  | (95 | ) |  | (80 | ) |  | (185 | ) |  | (161 | )
Realized capital gains and losses, after-tax |  | (9 | ) |  | — |  |  | (10 | ) |  | — |
Business combination expenses, after-tax |  | — |  |  | — |  |  | — |  |  | (13 | )
Corporate and Other net loss applicable to common shareholders |  | (104 | ) |  | (80 | ) |  | (195 | ) |  | (174 | )
Consolidated net income applicable to common shareholders |  | $ | 637 |  |  | $ | 550 |  |  | $ | 1,583 |  |  | $ | 1,216 |

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