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v3.22.2.2

General (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 18, 2022 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  |  | $ (17,561) |  | $ (25,127) | $ (26,707) |  |
Subsequent Event |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of headquarters | $ 232 |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Gain on sale of headquarters |  | $ 99 |  |  |  |  |  |
Accumlated Other Comprehensive Income |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  |  | 3,043 | $ 2,158 | (655) | (1,918) | $ (2,290) | $ (3,304)
Retained income |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  |  | $ (51,490) | $ (52,412) | $ (53,294) | $ (52,736) | $ (52,464) | $ (52,767)
Minimum | Forecast | Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  | 250 |  |  |  |  |  |
Minimum | Accumlated Other Comprehensive Income | Forecast | Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  | 235 |  |  |  |  |  |
Minimum | Retained income | Forecast | Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  | 15 |  |  |  |  |  |
Maximum | Forecast | Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  | 350 |  |  |  |  |  |
Maximum | Accumlated Other Comprehensive Income | Forecast | Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  | 315 |  |  |  |  |  |
Maximum | Retained income | Forecast | Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to equity |  | 35 |  |  |  |  |  |
Allstate Protection | Forecast | Net Gains (Losses) On Investments And Derivatives |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Gain on sale of headquarters |  | 16 |  |  |  |  |  |
Corporate Segment | Forecast | Other Income |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Gain on sale of headquarters |  | $ 83 |  |  |  |  |  |

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