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Summary of Significant Accounting Policies - Reportable segments financial performance (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income applicable to common shareholders | $ (585) | $ 942 | $ 678 | $ 977 | $ 1,294 | $ 810 | $ 549 | $ 785 | $ 2,012 | $ 3,438 | $ 1,692
Property-Liability |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 2,253 | 2,205 | 1,370
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 2,465 | 2,813 | 1,758
Service Businesses |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 8 | (54) | 5
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | (79) | 23 | 5
Allstate Life |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 295 | 259 | 251
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 260 | 589 | 223
Allstate Benefits |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 124 | 100 | 103
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 118 | 154 | 99
Allstate Annuities |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 131 | 205 | 102
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 76 | 419 | 77
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | (406) | (320) | (293)
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | (828) | (560) | (470)
Previously reported |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 2,104 | 3,073 | 1,761
Impact of change | Previously reported |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 2,104 | 3,073 | 1,761
Impact of change | Previously reported | Property-Liability |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 2,097 | 2,012 | 1,220
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 2,341 | 2,587 | 1,661
Impact of change | Previously reported | Service Businesses |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 2 | (59) | 3
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | (85) | 15 | 3
Impact of change | Previously reported | Allstate Life |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 289 | 253 | 247
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 254 | 577 | 219
Impact of change | Previously reported | Allstate Benefits |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 119 | 95 | 100
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 113 | 146 | 96
Impact of change | Previously reported | Allstate Annuities |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 130 | 204 | 101
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 75 | 418 | 76
Impact of change | Previously reported | Corporate and Other |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | (542) | (399) | (292)
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | (594) | (670) | (294)
Impact of change | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income applicable to common shareholders | $ (273) | $ 109 | $ 41 | $ 31 | $ 74 | $ 173 | $ (1) | $ 119 | (92) | 365 | (69)
Impact of change | Restatement Adjustment | Property-Liability |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 156 | 193 | 150
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 124 | 226 | 97
Impact of change | Restatement Adjustment | Service Businesses |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 6 | 5 | 2
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 6 | 8 | 2
Impact of change | Restatement Adjustment | Allstate Life |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 6 | 6 | 4
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 6 | 12 | 4
Impact of change | Restatement Adjustment | Allstate Benefits |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 5 | 5 | 3
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 5 | 8 | 3
Impact of change | Restatement Adjustment | Allstate Annuities |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 1 | 1 | 1
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 1 | 1 | 1
Impact of change | Restatement Adjustment | Corporate and Other |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted net income (loss) |  |  |  |  |  |  |  |  | 136 | 79 | (1)
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | $ (234) | $ 110 | $ (176)

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