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Acquisitions and Sale of Businesses (Details 2) - Run-off long-term care insurance business [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Life, accident and health net earned premiums: |  |  |  |
Long-term care | $ 20 | $ 19 | $ 37 | $ 38
Life operations | 2 | 2 | 5 | 5
Net investment income | 19 | 18 | 37 | 39
Realized gains (losses) on securities and other income | 0 | 1 | (2) | 2
Total revenues | 41 | 40 | 77 | 84
Annuity benefits | 2 | 2 | 4 | 4
Life, accident and health benefits: |  |  |  |
Long-term care | 25 | 28 | 46 | 57
Life operations | 2 | 3 | 5 | 6
Annuity and supplemental insurance acquisition expenses | 3 | 4 | 6 | 7
Other expenses | 5 | 3 | 9 | 7
Total costs and expenses | 37 | 40 | 70 | 81
Earnings before income taxes | $ 4 | $ 0 | $ 7 | $ 3

X
- Definition Annuity benefits of the disposal group includes 1) interest credited to policyholders accounts, which provides a guaranteed yield, 2) expenses related to excess benefits expected to be paid on future deaths and annuitizations and 3) net expenses related to changes in embedded derivatives on equity indexed annuities offset by equity index call options. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Annuity and supplemental insurance acquisition expenses of the disposal group. + References No definition available. + Details
Name: | afg_DisposalGroupAnnuityandSupplementalInsuranceAcquisitionExpenses
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The Life operations portion of life, accident and health benefits of the disposal group. + References No definition available. + Details
Name: | afg_DisposalGroupLifeAccidentandHealthBenefitsLifeOperations
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The Long-term care portion of life, accident and health benefits of the disposal group. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The Life operations portion of life, accident and health premiums of the disposal group. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
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X
- Definition The Long-term care portion of life, accident and health premiums of the disposal group. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents amount of other income attributable to the disposal group and the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity of the disposal group. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities of the disposal group. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Amount, after investment expense, of income earned from investments in securities and real estate of the disposal group. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References No definition available. + Details
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X
- Definition Life, accident and health benefits. + References No definition available. + Details
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- Definition Life, accident and health net earned premiums. + References No definition available. + Details
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- Definition Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of other expense attributable to disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Details
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