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v3.10.0.1

Reinsurance (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Property and casualty insurance premiums earned |  | $ | (257 | ) |  | $ | (254 | ) |  | $ | (496 | ) |  | $ | (500 | )
Life premiums and contract charges |  | (73 | ) |  | (75 | ) |  | (145 | ) |  | (150 | )
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 June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Property and casualty insurance claims and claims expense |  | $ | (138 | ) |  | $ | (124 | ) |  | $ | (325 | ) |  | $ | (255 | )
Life contract benefits |  | (66 | ) |  | (70 | ) |  | (115 | ) |  | (117 | )
Interest credited to contractholder funds |  | (7 | ) |  | (6 | ) |  | (11 | ) |  | (11 | )

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

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