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Derivatives - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) swap | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) swap | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Carrying value of collateral received to support purchased call options | $ 374,000,000 |  | $ 374,000,000 |  | $ 380,000,000
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Number of interest rate swaps designated and qualifying as a cash flow hedges | swap | 8 |  | 8 |  |
Notional amount of derivative instrument outstanding | $ 1,350,000,000 |  | $ 1,350,000,000 |  | 1,080,000,000
Gain (loss) reclassified from AOCI into net investment income | 1,000,000 | $ 2,000,000 | 4,000,000 | $ 5,000,000 |
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings | 0 | 0 | 0 | 0 |
Collateral receivable supporting interest rate swaps | 60,000,000 |  | 60,000,000 |  | 60,000,000
Other assets | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net derivatives, at fair value | 1,000,000 |  | 1,000,000 |  | 1,000,000
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net derivatives, at fair value | $ (21,000,000) |  | $ (21,000,000) |  | $ (22,000,000)
Senior Notes | 9-7/8% Senior Notes due June 2019 |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Stated interest rate, percentage | 9.875% |  | 9.875% |  |
AFG |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest rate description of fair value hedge activity |  |  | three-month LIBOR plus 8.099% |  |
AFG | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Effective interest rate, percentage | 9.419% |  | 9.419% |  | 9.0624%
The net reduction in interest expense from interest rate swaps |  | $ 1,000,000 | $ 1,000,000 | $ 3,000,000 |
AFG | Maximum | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
The net reduction in interest expense from interest rate swaps | $ 1,000,000 |  |  |  |
AFG | Long-term debt | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net derivatives, at fair value |  |  |  |  | $ 1,000,000
AFG | Long-term debt | Maximum | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net derivatives, at fair value | $ (1,000,000) |  | $ (1,000,000) |  |
AFG | Senior Notes | 9-7/8% Senior Notes due June 2019 |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Stated interest rate, percentage | 9.875% |  | 9.875% |  | 9.875%
AFG | LIBOR | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Basis spread on variable interest rate | 8.099% |  | 8.099% |  |
New interest rate swaps entered into during the period | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional amount of derivative instrument outstanding | $ 400,000,000 |  | $ 400,000,000 |  |
Number of interest rate swaps entered into during the period | swap | 1 |  |  |  |

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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 The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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