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Acquisitions and Dispositions - Narrative (Details) $ in Millions |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2021 USD ($) | Oct. 01, 2021 USD ($) state | Mar. 15, 2021 USD ($) | Feb. 03, 2021 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 04, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 3,497 | $ 3,502 |
Long-term debt |  |  |  |  | 7,973 | $ 7,976 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Allstate Life Insurance Company Of New York |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Definitive agreement with Wilton Reassurance |  | $ 400 |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Allstate Life Insurance Company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from affiliates | $ 4,000 |  |  |  |  |  |
Pre-close dividend | $ 1,250 |  |  |  |  |  |
Subordinated Debt |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Repaid of subordinated notes |  |  | $ 72 | $ 100 |  |  |
Subsequent acquisition (in percentage) |  |  |  | 7.625% |  |  |
Long-term debt |  |  |  |  | $ 350 |  |
Senior Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Subsequent acquisition (in percentage) |  |  |  |  | 6.75% |  |
National General Holdings Corp. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1,038
Purchase accounting fair value adjustment |  |  |  |  | $ 40 |  |
National General Holdings Corp. | Allstate Protection |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 675
National General Holdings Corp. | Protection Services |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 20
National General Holdings Corp. | Allstate Health and Benefits |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 343
SafeAuto |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of states acquiree operates in | state |  | 28 |  |  |  |  |
Cash to acquire businesses |  | $ 262 |  |  |  |  |

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