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Reinsurance and Indemnification - Other Reinsurance Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables | $ 70 |  |
Life insurance in force ceded to unaffiliated reinsurers | 74,021 | $ 81,186 | $ 86,642
Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Gross life insurance in force | 449,200 |  |
Life insurance in force ceded to unaffiliated reinsurers | 74,020 |  |
Life and annuity contract benefits |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 165 | 240 | 179
Interest credited to contractholder funds |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 20 | 24 | 25
Citigroup Subsidiaries and Scottish Re | Operating costs and expenses | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables | 112 | 118 |
Prudential | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables | 1,290 | 1,360 |
Prudential | Life and annuity premiums and contract charges | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 65 | 72 | 76
Prudential | Life and annuity contract benefits | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 4 | 87 | 7
Prudential | Interest credited to contractholder funds | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 19 | 20 | 20
Prudential | Operating costs and expenses | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 12 | $ 14 | $ 15
Lincoln Benefit Life Company |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Investments held by trust | $ 6,250 |  |
Reinsurer Concentration Risk | A- |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Concentration risk, percentage | 93.00% |  |
Reinsurer Concentration Risk | A- | Allstate Annuities |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Concentration risk, percentage |  | 93.00% |

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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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