XML 65 R50.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Investments (Details 11) $ in Millions | Sep. 30, 2017 USD ($) contract | Dec. 31, 2016 USD ($) security contract
--- | --- | ---
Fixed income and equity securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 1,892 | 2,590
Fair value, continuous unrealized loss position for less than 12 months | $ 13,511 | $ 18,572
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (142) | $ (407)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 391 | 334
Fair value, continuous unrealized loss position for 12 months or more | $ 1,789 | $ 1,087
Unrealized losses, continuous unrealized loss position for 12 months or more | (89) | (125)
Total unrealized losses |  |
Total unrealized losses | $ (231) | $ (532)
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 64 | 46
Fair value, continuous unrealized loss position for less than 12 months | $ 2,625 | $ 943
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (7) | $ (9)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 7 | 0
Fair value, continuous unrealized loss position for 12 months or more | $ 93 | $ 0
Unrealized losses, continuous unrealized loss position for 12 months or more | (1) | 0
Total unrealized losses |  |
Total unrealized losses | $ (8) | $ (9)
Municipal |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 938 | 1,310
Fair value, continuous unrealized loss position for less than 12 months | $ 1,736 | $ 3,073
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (14) | $ (76)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 83 | 8
Fair value, continuous unrealized loss position for 12 months or more | $ 172 | $ 29
Unrealized losses, continuous unrealized loss position for 12 months or more | (8) | (11)
Total unrealized losses |  |
Total unrealized losses | $ (22) | $ (87)
Corporate |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 560 | 862
Fair value, continuous unrealized loss position for less than 12 months | $ 7,468 | $ 13,343
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (74) | $ (256)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 94 | 83
Fair value, continuous unrealized loss position for 12 months or more | $ 1,370 | $ 678
Unrealized losses, continuous unrealized loss position for 12 months or more | (58) | (63)
Total unrealized losses |  |
Total unrealized losses | $ (132) | $ (319)
Foreign government |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 68 | 41
Fair value, continuous unrealized loss position for less than 12 months | $ 697 | $ 225
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (14) | $ (4)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 0 | 0
Fair value, continuous unrealized loss position for 12 months or more | $ 0 | $ 0
Unrealized losses, continuous unrealized loss position for 12 months or more | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ (14) | $ (4)
Asset-backed securities (“ABS”) |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 44 | 31
Fair value, continuous unrealized loss position for less than 12 months | $ 379 | $ 222
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (1) | $ (1)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 10 | 14
Fair value, continuous unrealized loss position for 12 months or more | $ 34 | $ 109
Unrealized losses, continuous unrealized loss position for 12 months or more | (8) | (10)
Total unrealized losses |  |
Total unrealized losses | $ (9) | $ (11)
Residential mortgage-backed securities (“RMBS”) |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 84 | 89
Fair value, continuous unrealized loss position for less than 12 months | $ 42 | $ 53
Unrealized losses, continuous unrealized loss position for less than 12 months | $ 0 | $ (1)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 176 | 179
Fair value, continuous unrealized loss position for 12 months or more | $ 57 | $ 91
Unrealized losses, continuous unrealized loss position for 12 months or more | (2) | (7)
Total unrealized losses |  |
Total unrealized losses | $ (2) | $ (8)
Commercial mortgage-backed securities (“CMBS”) |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 5 | 15
Fair value, continuous unrealized loss position for less than 12 months | $ 20 | $ 59
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (2) | $ (4)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 4 | 4
Fair value, continuous unrealized loss position for 12 months or more | $ 15 | $ 15
Unrealized losses, continuous unrealized loss position for 12 months or more | (2) | (5)
Total unrealized losses |  |
Total unrealized losses | $ (4) | $ (9)
Redeemable preferred stock |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | security |  | 1
Fair value, continuous unrealized loss position for less than 12 months |  | $ 0
Unrealized losses, continuous unrealized loss position for less than 12 months |  | $ 0
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | security |  | 0
Fair value, continuous unrealized loss position for 12 months or more |  | $ 0
Unrealized losses, continuous unrealized loss position for 12 months or more |  | 0
Total unrealized losses |  |
Total unrealized losses |  | $ 0
Fixed income securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 1,763 | 2,395
Fair value, continuous unrealized loss position for less than 12 months | $ 12,967 | $ 17,918
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (112) | $ (351)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 374 | 288
Fair value, continuous unrealized loss position for 12 months or more | $ 1,741 | $ 922
Unrealized losses, continuous unrealized loss position for 12 months or more | (79) | (96)
Total unrealized losses |  |
Total unrealized losses | $ (191) | $ (447)
Equity securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 129 | 195
Fair value, continuous unrealized loss position for less than 12 months | $ 544 | $ 654
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (30) | $ (56)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 17 | 46
Fair value, continuous unrealized loss position for 12 months or more | $ 48 | $ 165
Unrealized losses, continuous unrealized loss position for 12 months or more | (10) | (29)
Total unrealized losses |  |
Total unrealized losses | $ (40) | $ (85)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 1,689 | 2,202
Fair value, continuous unrealized loss position for less than 12 months | $ 12,345 | $ 15,678
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (96) | $ (293)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 323 | 201
Fair value, continuous unrealized loss position for 12 months or more | $ 1,530 | $ 493
Unrealized losses, continuous unrealized loss position for 12 months or more | (53) | (51)
Total unrealized losses |  |
Total unrealized losses | $ (149) | $ (344)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 74 | 193
Fair value, continuous unrealized loss position for less than 12 months | $ 622 | $ 2,240
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (16) | $ (58)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 51 | 87
Fair value, continuous unrealized loss position for 12 months or more | $ 211 | $ 429
Unrealized losses, continuous unrealized loss position for 12 months or more | (26) | (45)
Total unrealized losses |  |
Total unrealized losses | $ (42) | $ (103)

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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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_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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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_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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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_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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_RedeemablePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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