XML 74 R53.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Investments - Gross unrealized losses and fair value by the type and length of time held in continuous unrealized loss position (Details) $ in Millions | Jun. 30, 2018 USD ($) contract | Dec. 31, 2017 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 67 | 66
Fair value | $ 2,022 | $ 2,829
Unrealized losses | $ (15) | $ (18)
12 months or more |  |
Number of issues | contract | 11 | 18
Fair value | $ 55 | $ 182
Unrealized losses | (1) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (16) | $ (20)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 2,456 | 1,756
Fair value | $ 4,039 | $ 3,143
Unrealized losses | $ (57) | $ (24)
12 months or more |  |
Number of issues | contract | 151 | 165
Fair value | $ 268 | $ 349
Unrealized losses | (14) | (12)
Total unrealized losses |  |
Total unrealized losses | $ (71) | $ (36)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 1,888 | 781
Fair value | $ 24,450 | $ 11,616
Unrealized losses | $ (603) | $ (102)
12 months or more |  |
Number of issues | contract | 240 | 208
Fair value | $ 2,878 | $ 3,289
Unrealized losses | (156) | (102)
Total unrealized losses |  |
Total unrealized losses | $ (759) | $ (204)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 15 | 45
Fair value | $ 84 | $ 580
Unrealized losses | $ 0 | $ (10)
12 months or more |  |
Number of issues | contract | 27 | 5
Fair value | $ 448 | $ 44
Unrealized losses | (9) | (1)
Total unrealized losses |  |
Total unrealized losses | $ (9) | $ (11)
Asset-backed securities (“ABS”) |  |
Less than 12 months |  |
Number of issues | contract | 76 | 57
Fair value | $ 505 | $ 476
Unrealized losses | $ (5) | $ (3)
12 months or more |  |
Number of issues | contract | 8 | 9
Fair value | $ 13 | $ 34
Unrealized losses | (3) | (4)
Total unrealized losses |  |
Total unrealized losses | $ (8) | $ (7)
Residential mortgage-backed securities (“RMBS”) |  |
Less than 12 months |  |
Number of issues | contract | 143 | 118
Fair value | $ 35 | $ 35
Unrealized losses | $ (1) | $ (1)
12 months or more |  |
Number of issues | contract | 181 | 181
Fair value | $ 40 | $ 50
Unrealized losses | (1) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (2) | $ (3)
Commercial mortgage-backed securities (“CMBS”) |  |
Less than 12 months |  |
Number of issues | contract | 2 | 2
Fair value | $ 11 | $ 1
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 5 | 6
Fair value | $ 10 | $ 23
Unrealized losses | (2) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (2) | $ (2)
Redeemable preferred stock |  |
Less than 12 months |  |
Number of issues | contract | 1 | 1
Fair value | $ 0 | $ 0
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 0 | 0
Fair value | $ 0 | $ 0
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ 0 | $ 0
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 4,648 | 2,826
Fair value | $ 31,146 | $ 18,680
Unrealized losses | $ (681) | $ (158)
12 months or more |  |
Number of issues | contract | 623 | 592
Fair value | $ 3,712 | $ 3,971
Unrealized losses | (186) | (125)
Total unrealized losses |  |
Total unrealized losses | (867) | $ (283)
Equity securities |  |
Less than 12 months |  |
Number of issues | contract |  | 127
Fair value |  | $ 369
Unrealized losses |  | $ (12)
12 months or more |  |
Number of issues | contract |  | 2
Fair value |  | $ 0
Unrealized losses |  | 0
Total unrealized losses |  |
Total unrealized losses |  | $ (12)
Fixed income and equity securities |  |
Less than 12 months |  |
Number of issues | contract |  | 2,953
Fair value |  | $ 19,049
Unrealized losses |  | $ (170)
12 months or more |  |
Number of issues | contract |  | 594
Fair value |  | $ 3,971
Unrealized losses |  | (125)
Total unrealized losses |  |
Total unrealized losses | $ (867) | $ (295)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 4,218 | 2,706
Fair value | $ 27,970 | $ 17,668
Unrealized losses | $ (573) | $ (134)
12 months or more |  |
Number of issues | contract | 575 | 535
Fair value | $ 3,537 | $ 3,751
Unrealized losses | (168) | (98)
Total unrealized losses |  |
Total unrealized losses | $ (741) | $ (232)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 430 | 120
Fair value | $ 3,176 | $ 1,012
Unrealized losses | $ (108) | $ (24)
12 months or more |  |
Number of issues | contract | 48 | 57
Fair value | $ 175 | $ 220
Unrealized losses | (18) | (27)
Total unrealized losses |  |
Total unrealized losses | $ (126) | $ (51)

X
- References No definition available. + Details
Name: | all_LessThanTwelveMonthsAbstract
Namespace Prefix: | all_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of issues of available for sale securities that have been in a continuous unrealized loss position for 12 months or more. + References No definition available. + Details
Name: | all_NumberOfIssuesOfAvailableForSaleSecuritiesForTwelveMonthsOrLongerPeriod
Namespace Prefix: | all_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of issues of available for sale securities that have been in a continuous unrealized loss position for less than 12 months. + References No definition available. + Details
Name: | all_NumberOfIssuesOfAvailableForSaleSecuritiesLessThanTwelveMonths
Namespace Prefix: | all_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | all_TotalUnrealizedLossAbstract
Namespace Prefix: | all_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | all_TwelveMonthsOrMoreAbstract
Namespace Prefix: | all_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Namespace Prefix: | us-gaap_
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 continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
Namespace Prefix: | us-gaap_
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 continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References No definition available. + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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. + 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=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_RedeemablePreferredStockMember
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: |

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

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

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: |