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Reinsurance - Asbestos, environmental and other, Allstate Financial (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) reinsurer | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables, net | $ 8,921 | $ 8,745 |
Life insurance in force ceded to unaffiliated reinsurers | 86,642 | 90,011 | $ 93,326
Lloyds of London |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables, net | 167 | 174 |
Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables, net | $ 2,354 | 2,468 |
Percent of morbidity risk ceded for term-life insurance policies | 90.00% |  |
Number of unaffiliated reinsurers | reinsurer | 14 |  |
Gross life insurance in force | $ 447,860 |  |
Life insurance in force ceded to unaffiliated reinsurers | 86,640 |  |
Allstate Financial | Prudential |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables, net | 1,350 | 1,410 |
Allstate Financial | Citigroup Subsidiaries and Scottish Re |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Reinsurance recoverables, net | 139 | 144 |
Life and annuity premiums and contract charges | Allstate Financial | Prudential |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 76 | 78 | 94
Life and annuity contract benefits |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 179 | 208 | 219
Life and annuity contract benefits | Allstate Financial | Prudential |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 7 | 21 | 40
Interest credited to contractholder funds |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 25 | 26 | 25
Interest credited to contractholder funds | Allstate Financial | Prudential |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 20 | 20 | 21
Operating costs and expenses | Allstate Financial | Prudential |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Ceded losses incurred | 15 | $ 15 | $ 18
LBL |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Investments held by trust | $ 5,890 |  |
Reinsurer Concentration Risk | A- | Allstate Financial |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Concentration risk, percentage | 92.00% | 92.00% |

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