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Segments of Operations (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 segment | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Number of segments |  |  |  |  | 4 |  |  |
Earnings (losses) of managed investment entities attributable to noncontrolling interests | $ (18) | [1] | $ (31) | [1] | $ (18) | [1] | $ (42) | [1]
Other [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Earnings (losses) of managed investment entities attributable to noncontrolling interests | (18) |  | (31) |  | (18) |  | (42) |
Insurance-related assessments [Member] | Annuity [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Charge for guaranty fund assessments for the insolvency and liquidation of an unaffiliated life insurance company |  |  | $ 5 |  |  |  |  |
[1] | Included in Earnings before income taxes in AFG’s Statement of Earnings.

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- Definition Earnings (losses) of variable interest entities attributable to noncontrolling interests. + References No definition available. + Details
Name: | afg_EarningsLossesOfVariableInterestEntitiesAttributableToNoncontrollingInterests
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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