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Fair Value Measurements (Details 1) (Embedded derivatives [Member]) | 3 Months Ended
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Mar. 31, 2014
Unobservable inputs used by management in determining fair value of embedded derivatives |
Risk margin for uncertainty in cash flows | 0.30%
Minimum [Member] |
Unobservable inputs used by management in determining fair value of embedded derivatives |
Adjustment for insurance subsidiary's credit risk | 0.40%
Surrenders | 4.00%
Partial surrenders | 2.00%
Annuitizations | 1.00%
Deaths | 1.50%
Budgeted option costs | 2.50%
Maximum [Member] |
Unobservable inputs used by management in determining fair value of embedded derivatives |
Adjustment for insurance subsidiary's credit risk | 1.60%
Surrenders | 16.00%
Partial surrenders | 6.00%
Annuitizations | 2.00%
Deaths | 2.50%
Budgeted option costs | 4.00%

X
- Definition Risk associated with risk of annuitizations, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsAnnuitizations
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of budgeted option costs, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsBudgetedOptionCosts
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of deaths, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsDeaths
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of partial surrenders, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsPartialSurrenders
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk margin for uncertainty in cash flows, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsRiskMarginForUncertaintyInCashFlows
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of surrenders, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsSurrenders
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | afg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration