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General - Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | $ 821 | $ 678 | $ 2,082 | $ 1,655
Property-Liability |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | 863 | 630 | 2,045 | 1,620
Service Businesses |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | (46) | (15) | (52) | (37)
Underwriting income or Adjusted net income (loss) | 16 | 2 | 27 | (1)
Allstate Life |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | 67 | 75 | 134 | 142
Underwriting income or Adjusted net income (loss) | 68 | 80 | 141 | 151
Allstate Benefits |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | 39 | 36 | 73 | 63
Underwriting income or Adjusted net income (loss) | 37 | 36 | 68 | 65
Allstate Annuities |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | 88 | 50 | 185 | 67
Underwriting income or Adjusted net income (loss) | 52 | 44 | 27 | 79
Corporate and Other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | (190) | (98) | (303) | (200)
Underwriting income or Adjusted net income (loss) | (98) | (95) | (201) | (185)
Previously reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | 890 | 637 | 2,146 | 1,583
Impact of change | Impact of change |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income (loss) applicable to common shareholders | $ (69) | $ 41 | $ (64) | $ 72

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