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Deferred Policy Acquisition and Sales Inducement Costs - Deferred sales inducement costs activity (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred sales inducement costs activity |  |  |
Balance, beginning of year | $ 27 | $ 34 | $ 36
Amortization charged to income | (5) | (5) | (4)
Effect of unrealized gains and losses | 3 | (2) | 2
Balance, end of year | $ 25 | $ 27 | $ 34

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- Definition Represents the amortization of deferred sales inducements charged to income. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Represents the impact of unrealized capital gains and losses on the carrying amount of deferred sales inducement costs. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of deferred sale inducement cost capitalized on contract remaining in force. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 2B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121638524&loc=SL117422543-158416 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6481654&loc=d3e11214-158414 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121638524&loc=d3e11332-158416 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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