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v3.20.1

Reserve for Property and Casualty Insurance Claims and Claims Expense - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Increase (decrease) in claims and claims expense |  |  |
Reserves for asbestos claims | $ 790 |  | $ 810
Reinsurance recoverables for asbestos claims | (351) |  | (362)
Reserves for environmental claims | 175 |  | 179
Reinsurance recoverables for environmental claims | (39) |  | $ (40)
Catastrophe |  |  |
Increase (decrease) in claims and claims expense |  |  |
Total incurred | $ 211 | $ 680 |

X
- Definition Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos, net of estimated reinsurance recoveries. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to environmental claims, net of estimated reinsurance recoveries. + References No definition available. + Details
Name: | all_LiabilityForEnvironmentalClaimsNet
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
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- Definition The known and estimated amount recoverable related to asbestos claims as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance. + References No definition available. + Details
Name: | all_ReinsuranceRecoverablesAsbestos
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The known and estimated amount recoverable related to environment related claims as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance. + References No definition available. + Details
Name: | all_ReinsuranceRecoverablesEnvironment
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
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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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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Details
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