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Reinsurance and Indemnification - Reinsurance recoverables on paid and unpaid benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reinsurance Retention Policy [Line Items] |  |
Recoverables | $ 7,033 |
Reinsurance and indemnification recoverables, net | $ 9,220 | $ 9,211
A- | Reinsurer Concentration Risk |  |
Reinsurance Retention Policy [Line Items] |  |
Concentration risk, percentage | 94.00% | 93.00%
Property and casualty |  |
Reinsurance Retention Policy [Line Items] |  |
Paid | $ 101 | $ 112
Recoverables | 7,033 | 6,912
Reinsurance and indemnification recoverables, net | 7,134 | 7,024
Allstate Annuities |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance and indemnification recoverables, net | 1,293 | 1,305
Allstate Life |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance and indemnification recoverables, net | 712 | 794
Allstate Benefits |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance and indemnification recoverables, net | $ 81 | $ 88

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to and paid by the ceding insurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 + Details
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