XML 74 R55.htm IDEA: XBRL DOCUMENT
v3.19.2

Investments - Valuation changes included in net income for investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Investment [Line Items] |  |  |  |
Total | $ 302 | $ 122 | $ 747 | $ 177
Equity securities |  |  |  |
Investment [Line Items] |  |  |  |
Total | 207 | 94 | 688 | 71
Limited partnership interests |  |  |  |
Investment [Line Items] |  |  |  |
Total | $ 95 | $ 28 | $ 59 | $ 106

X
- Definition Realized Gain (Loss), Fair Value Recognized In Net Income + References No definition available. + Details
Name: | all_RealizedGainLossFairValueRecognizedInNetIncome
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent reporting 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
Name: | invest_InvestmentLineItems
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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