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Segments of Operations (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 segment | Mar. 31, 2013
Segments of Operations (Textual) [Abstract] |  |  |  |
Number of segments | 4 |  |  |
Earnings (losses) of managed investment entities attributable to noncontrolling interests (are less than in 2014) | $ 0 | [1] | $ (11) | [1]
Other [Member] |  |  |  |
Segments of Operations (Textual) [Abstract] |  |  |  |
Earnings (losses) of managed investment entities attributable to noncontrolling interests (are less than in 2014) |  |  | (11) |
Maximum [Member] | Other [Member] |  |  |  |
Segments of Operations (Textual) [Abstract] |  |  |  |
Earnings (losses) of managed investment entities attributable to noncontrolling interests (are less than in 2014) | $ 1 |  |  |
[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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- Details
Name: | afg_SegmentsOfOperationsTextualAbstract
Namespace Prefix: | afg_
Data Type: | xbrli:stringItemType
Balance Type: | na
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