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Reinsurance and Indemnification - Other Reinsurance Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables | $ 66 | $ 73 |
Life insurance in force ceded to unaffiliated reinsurers | 67,319 | 74,021 | $ 81,186
Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Gross life insurance in force | 425,440 |  |
Life insurance in force ceded to unaffiliated reinsurers | 67,320 |  |
Prudential | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables | 1,280 | 1,290 |
Citigroup Subsidiaries and Scottish Re | Operating costs and expenses | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables | 99 | $ 112 |
Lincoln Benefit Life Company |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Investments held by trust | $ 6,290 |  |

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- Definition Amount of life insurance issued and outstanding ceded to other entity, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Subsection 17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column C)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 + Details
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- Definition Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References No definition available. + Details
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