XML 55 R30.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Reinsurance (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
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,
| 2018 |  | 2017
Property and casualty insurance premiums earned |  | $ | (239 | ) |  | $ | (246 | )
Life premiums and contract charges |  | (72 | ) |  | (75 | )
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,
| 2018 |  | 2017
Property and casualty insurance claims and claims expense |  | $ | (187 | ) |  | $ | (131 | )
Life contract benefits |  | (49 | ) |  | (47 | )
Interest credited to contractholder funds |  | (4 | ) |  | (5 | )

X
- 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
Name: | all_ScheduleOfReinsuranceClaimsBenefitsCededTableTextBlock
Namespace Prefix: | all_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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

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