XML 77 R56.htm IDEA: XBRL DOCUMENT
v3.20.2

Investments Investments - Gross unrealized losses by unrealized loss position and credit quality (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Total unrealized losses | $ (1) |
Investment grade fixed income securities |  |
Schedule of Investments [Line Items] |  |
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (1) (2) | (82) |
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost | (29) |
Total unrealized losses | (111) | $ (61)
Below investment grade fixed income securities |  |
Schedule of Investments [Line Items] |  |
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (1) (2) | (124) |
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost | (80) |
Total unrealized losses | (204) | (35)
Unrealized losses having loss of less than twenty percent, less than 12 months | (109) |
Fixed income securities |  |
Schedule of Investments [Line Items] |  |
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (1) (2) | (206) |
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost | (109) |
Total unrealized losses | $ (315) | $ (96)

X
- Definition The amount of unrealized losses that are related to securities with an unrealized loss position less than 20% of cost or amortized cost. + References No definition available. + Details
Name: | all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of unrealized losses that are related to securities with an unrealized loss position greater than 20% of cost or amortized cost. + References No definition available. + Details
Name: | all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available for sale Securities, Unrealized Losses Having Loss of Less than Twenty Percent, Less than 12 Months + References No definition available. + Details
Name: | all_AvailableforsaleSecuritiesUnrealizedLossesHavingLossofLessthanTwentyPercentLessthan12Months
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=all_InvestmentGradeFixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=all_BelowInvestmentGradeFixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |