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Reinsurance - Reinsurance recoverables on paid and unpaid benefits (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Reinsurance Retention Policy [Line Items] |  |
Reinsurance recoverables, net | $ 8,921 | $ 8,745
Allstate Financial |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance recoverables, net | 2,354 | 2,468
Allstate Financial | Annuities |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance recoverables, net | 1,370 | 1,424
Allstate Financial | Life insurance |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance recoverables, net | 817 | 860
Allstate Financial | Other |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance recoverables, net | $ 167 | $ 184

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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