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v3.19.1

Reinsurance (Tables) | 3 Months Ended
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Mar. 31, 2019
Reinsurance Disclosures [Abstract] |
Schedule of reductions to premiums and contract charges due to reinsurance premium ceded amounts |
Effects of reinsurance ceded on property and casualty premiums earned and life premiums and contract charges
($ in millions) |  | Three months ended March 31,
| 2019 |  | 2018
Property and casualty insurance premiums earned |  | $ | (260 | ) |  | $ | (239 | )
Life premiums and contract charges |  | (63 | ) |  | (72 | )
Schedule of reductions to costs and expenses due to reinsurance ceded amounts |
Effects of reinsurance ceded on property and casualty insurance claims and claims expense, life contract benefits and interest credited to contractholder funds
($ in millions) |  | Three months ended March 31,
| 2019 |  | 2018
Property and casualty insurance claims and claims expense |  | $ | (91 | ) |  | $ | (187 | )
Life contract benefits |  | (23 | ) |  | (49 | )
Interest credited to contractholder funds |  | (3 | ) |  | (4 | )

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- Definition This element may be used as a single block of text to encapsulate entire disclosure, including data and tables for reinsurance claims and benefits ceded. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition This element may be used as a single block of text to encapsulate entire disclosure, including data and tables for reinsurance premium ceded. + References No definition available. + Details
Name: | all_ScheduleOfReinsurancePremiumCededTableTextBlock
Namespace Prefix: | all_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReinsuranceDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration