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General - Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | $ 1,261 | $ 977
Property-Liability |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | 1,182 | 990
Service Businesses |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | (6) | (22)
Underwriting income or Adjusted net income (loss) | 11 |
Allstate Life |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | 67 | 67
Underwriting income or Adjusted net income (loss) | 73 |
Allstate Benefits |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | 34 | 27
Underwriting income or Adjusted net income (loss) | 31 |
Allstate Annuities |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | 97 | 17
Underwriting income or Adjusted net income (loss) | (25) |
Corporate and Other |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | (113) | (102)
Underwriting income or Adjusted net income (loss) | (103) |
Previously reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | 1,256 | 946
Impact of change | Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income (loss) applicable to common shareholders | $ 5 | $ 31

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