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Managed Investment Entities (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 collateralizedloanobligation | Mar. 31, 2013 | Dec. 31, 2013
Variable Interest Entity [Line Items] |  |  |
Percentage of investment of most subordinate debt tranche, Minimum | 7.50% |  |
Percentage of investment of most subordinate debt tranche, Maximum | 51.20% |  |
Number of collateralized loan obligation entities | 11 |  |
Proceeds received by subsidiaries related to redemptions of managed investment entities liabilities | $ 29 | $ 18 |
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments | 14 |  | 15
Difference between aggregate unpaid principal balance and fair value of CLOs' debt | 109 |  | 109
Carrying amount of CLO loans in default | 2 |  | 1
Aggregate unpaid principal balance of CLO loans in default | 6 |  | 6
Variable interest entity, primary beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate fair value of investment in collateralized loan obligations | 260 |  | 271
Subordinated debt obligations [Member] | Variable interest entity, primary beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate fair value of investment in collateralized loan obligations | 101 |  |
Senior debt obligations [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date | 3 | 70 |
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date | $ 3 | $ 67 |

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- Definition Aggregate unpaid principal balance of variable interest entity loans in default. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date. + References No definition available. + Details
Name: | afg_AmountPaidBySubsidiariesToPurchaseManagedInvestmentEntitiesLiabilitiesAfterIssuanceDate.
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount of variable interest entity loans in default. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Difference between aggregate unpaid principal balance and fair value of variable interest entity debt. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Difference between aggregate unpaid principal balance and fair value of variable interest entity investments. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of collateralized loan obligation entities. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Maximum percentage of investment of most subordinate debt tranche of variable interest entity. + References No definition available. + Details
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Namespace Prefix: | afg_
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- Definition Minimum percentage of investment of most subordinate debt tranche of variable interest entity. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Proceeds received by subsidiaries related to redemptions of managed investment entities liabilities. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
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- Details
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