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Derivatives (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Indexed annuities as a percentage of annuity benefits | 60.00% |  |  | 60.00% |
Carrying value of collateral received to support purchased call options | $ 88,000,000 |  |  | $ 88,000,000 |
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Contract term of derivative instrument |  |  | 5 years |  |
Notional amount of derivative instrument outstanding |  |  | $ 431,000,000 |  |
Gain (loss) reclassified from AOCI into net investment income | 2,000,000 |  |  | 4,000,000 |
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings | 0 |  |  | 0 |
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Five-year interest rate swap [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Contract term of derivative instrument |  | 5 years |  |  |
Notional amount of derivative instrument outstanding |  | $ 195,000,000 |  |  |
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Fifteen-year interest rate swap [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Contract term of derivative instrument |  | 15 years |  |  |
Notional amount of derivative instrument outstanding |  | $ 132,000,000 |  |  |
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount of derivative instrument outstanding | 644,000,000 |  |  | 644,000,000 | $ 401,000,000
Other assets [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net derivatives, at fair value (are less than in 2014) | $ 8,000,000 |  |  | $ 8,000,000 |
Other assets [Member] | Maximum [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net derivatives, at fair value (are less than in 2014) |  |  |  |  | $ 1,000,000
Senior Notes [Member] | 9-7/8% Senior Notes due June 2019 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Stated interest rate, percentage | 9.875% |  |  | 9.875% |
AFG [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest rate description of fair value hedge activity |  |  |  | three-month LIBOR plus 8.099% |
AFG [Member] | Fair Value Hedge [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Effective interest rate, percentage | 8.4362% |  |  | 8.4362% |
The net reduction in interest expense from interest rate swaps | $ 1,000,000 |  |  | $ 1,000,000 |
AFG [Member] | Long-term debt [Member] | Fair Value Hedge [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net derivatives, at fair value (are less than in 2014) | $ 7,000,000 |  |  | $ 7,000,000 |
AFG [Member] | Senior Notes [Member] | 9-7/8% Senior Notes due June 2019 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Stated interest rate, percentage | 9.875% |  |  | 9.875% |
AFG [Member] | LIBOR [Member] | Fair Value Hedge [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Basis spread on variable interest rate | 8.099% |  |  | 8.099% |

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- Definition The change in the amount of the cost of borrowed funds accounted for as interest expense for debt due to the impact from interest rate swaps associated with the hedged debt during the period. + References No definition available. + Details
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- Definition Indexed annuities as a percentage of annuity benefits. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959 + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Contains all pertinent information about an entity's fair value hedging activities. + 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=56946850&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 1 -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579240-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41620-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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