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Derivatives (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |
Indexed annuities as a percentage of annuity benefits | 50.00%
Carrying value of collateral received to support purchased call options | $ 249
Interest rate swaptions [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Notional amount of derivative instrument outstanding | 200
Payments to purchase swaptions | $ 4

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- Definition Carrying value as of the balance sheet date of cash collateral received to support purchased call option assets. + References No definition available. + Details
Name: | afg_CarryingValueOfCollateralReceivedToSupportPurchasedCallOptions
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cumulative life-to-date payments (including payments made in prior years) to purchase derivatives that have not matured. + References No definition available. + Details
Name: | afg_CumulativePaymentstoPurchaseDerivatives
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Indexed annuities as a percentage of annuity benefits. + References No definition available. + Details
Name: | afg_IndexedAnnuitiesAsPercentageOfAnnuityBenefits
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
Name: | us-gaap_DerivativeAssetNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration