XML 110 R83.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Investments - Mortgage loans (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($)
Mortgage Loans on Real Estate |  |
Carrying value | $ 4,534 | $ 4,486
Percent | 100.00% | 100.00%
Mortgage loans, not in foreclosure |  |
Mortgage Loans on Real Estate |  |
Number of loans | loan | 285 |
Carrying value | $ 4,534 |
Percent | 100.00% |
Mortgage loans, not in foreclosure | 2018 |  |
Mortgage Loans on Real Estate |  |
Number of loans | loan | 17 |
Carrying value | $ 169 |
Percent | 3.70% |
Mortgage loans, not in foreclosure | 2019 |  |
Mortgage Loans on Real Estate |  |
Number of loans | loan | 10 |
Carrying value | $ 268 |
Percent | 5.90% |
Mortgage loans, not in foreclosure | 2020 |  |
Mortgage Loans on Real Estate |  |
Number of loans | loan | 14 |
Carrying value | $ 192 |
Percent | 4.20% |
Mortgage loans, not in foreclosure | 2021 |  |
Mortgage Loans on Real Estate |  |
Number of loans | loan | 43 |
Carrying value | $ 625 |
Percent | 13.80% |
Mortgage loans, not in foreclosure | Thereafter |  |
Mortgage Loans on Real Estate |  |
Number of loans | loan | 201 |
Carrying value | $ 3,280 |
Percent | 72.40% |
Apartment complex |  |
Mortgage Loans on Real Estate |  |
Percent | 30.90% | 27.60%
Office buildings |  |
Mortgage Loans on Real Estate |  |
Percent | 23.80% | 23.90%
Retail |  |
Mortgage Loans on Real Estate |  |
Percent | 18.00% | 20.40%
Warehouse |  |
Mortgage Loans on Real Estate |  |
Percent | 15.70% | 17.00%
Other |  |
Mortgage Loans on Real Estate |  |
Percent | 11.60% | 11.10%
California |  |
Mortgage Loans on Real Estate |  |
Percent | 19.90% | 19.30%
Texas |  |
Mortgage Loans on Real Estate |  |
Percent | 13.00% | 10.50%
New Jersey |  |
Mortgage Loans on Real Estate |  |
Percent | 7.60% | 8.20%
Illinois |  |
Mortgage Loans on Real Estate |  |
Percent | 7.10% | 6.70%
Florida |  |
Mortgage Loans on Real Estate |  |
Percent | 6.40% | 5.40%

X
- Definition This element represents the amount of mortgage loans as a percentage of total carrying value. + References No definition available. + Details
Name: | all_MortgageLoansOnRealEstateCarryingValuePercentage
Namespace Prefix: | all_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
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_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
Name: | us-gaap_MortgageLoansOnRealEstateNumberOfLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=all_MortgagesNotInForeclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=all_MortgageLoansOnRealEstateMaturingInYearOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=all_MortgageLoansOnRealEstateMaturingInYearTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=all_MortgageLoansOnRealEstateMaturingInYearThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=all_MortgageLoansOnRealEstateMaturingInYearFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=all_MortgageLoansOnRealEstateMaturingAfterYearFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_ApartmentBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_OfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_RetailSiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_WarehouseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_OtherPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_TX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_NJ
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_IL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_FL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |