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Reinsurance and Indemnification - Other Reinsurance Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reinsurance Retention Policy [Line Items] |  |  |
Life insurance in force ceded to unaffiliated reinsurers | $ 81,186 | $ 86,642 | $ 90,011
Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Gross life insurance in force | 450,600 |  |
Life insurance in force ceded to unaffiliated reinsurers | 81,190 |  |
Life and annuity contract benefits |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 240 | 179 | 208
Interest credited to contractholder funds |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 24 | 25 | 26
Citigroup Subsidiaries and Scottish Re | Operating costs and expenses | Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables | 118 | 139 |
Westport Insurance Corporation | Property-Liability |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Largest reinsurance recoverable from a single reinsurer | 60 | 61 |
Prudential | Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables | 1,360 | 1,350 |
Prudential | Life and annuity premiums and contract charges | Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 72 | 76 | 78
Prudential | Life and annuity contract benefits | Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 87 | 7 | 21
Prudential | Interest credited to contractholder funds | Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 20 | 20 | 20
Prudential | Operating costs and expenses | Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 14 | $ 15 | $ 15
Lincoln Benefit Life Company |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Investments held by trust | $ 5,940 |  |
Reinsurer Concentration Risk | A- |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Concentration risk, percentage | 93.00% | 92.00% |
Reinsurer Concentration Risk | A- | Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Concentration risk, percentage |  | 92.00% |

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- Definition Represents the amount of reported and estimated unreported claims assumed by and receivable from the identified reinsurer with respect to disclosure of a concentration of credit risk. + References No definition available. + Details
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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=34713774&loc=d3e574992-122915 + Details
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