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Derivatives (Details) (Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | $ 467 | $ 433
Derivative liability, at fair value | 916 | 814
MBS with embedded derivatives [Member] | Fixed maturities [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | 162 | 140
Public company warrants [Member] | Equity securities [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | 17 | 19
Interest rate swaptions [Member] | Other investments [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | 1 | 2
Fixed-indexed annuities (embedded derivative) [Member] | Annuity benefits accumulated [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative liability, at fair value | 904 | 804
Equity index call options [Member] | Other investments [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | 287 | 272
Reinsurance contracts (embedded derivative) [Member] | Other liabilities [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative liability, at fair value | $ 12 | $ 10

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- Definition Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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- Definition Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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