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Reporting Segments - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) segment item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information |  |  |
Number of reportable segments | segment | 7 |  |
Allstate Protection |  |  |
Segment Reporting Information |  |  |
Premium earned as percentage of consolidated revenues | 83.00% |  |
Number of states in which entity operates | item | 50 |  |
Minimum percentage of premiums to be considered as significant | 5.00% |  |
Revenues from external customers generated outside the United States | $ 1,200 | $ 1,130 | $ 1,080
Allstate Life |  |  |
Segment Reporting Information |  |  |
Number of states in which entity operates | item | 50 |  |
Minimum percentage of premiums to be considered as significant | 5.00% |  |
Consumer product protection plans | Service Businesses |  |  |
Segment Reporting Information |  |  |
Insurance commissions and fees | $ 503 | 295 | $ 0
Consumer product protection plans | Service Businesses | Non-US |  |  |
Segment Reporting Information |  |  |
Insurance commissions and fees | $ 61 | $ 35 |

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- Definition Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition This element represents the minimum percentage of premiums from a single jurisdiction to be considered as significant for the disclosure of a concentration of risk. + References No definition available. + Details
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- Definition This element represents the amount of premiums earned as a percentage of consolidated revenues. + References No definition available. + Details
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Period Type: | instant

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- Definition Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c),(d)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- 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
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |

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- Details
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- Details
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- Details
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