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Derivatives - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) swap | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) swap | Sep. 30, 2015 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Carrying value of collateral received to support purchased call options | $ 300,000,000 |  | $ 300,000,000 |  |  | $ 211,000,000
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 | 4 |  | 4 |  |  |
Notional amount of derivative instrument outstanding | $ 677,000,000 |  | $ 677,000,000 |  |  | 614,000,000
Gain (loss) reclassified from AOCI into net investment income | 2,000,000 | $ 2,000,000 | 5,000,000 | $ 4,000,000 |  |
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings | 0 | 0 | 0 | 0 |  |
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps | Seven-year and nine-month interest rate swap |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional amount of derivative instrument outstanding |  |  |  |  | $ 163,000,000 |
Other assets | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net derivatives, at fair value | 14,000,000 |  | 14,000,000 |  |  | 2,000,000
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net derivatives, at fair value | $ 0 |  | $ 0 |  |  |
Other liabilities | Maximum | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net derivatives, at fair value |  |  |  |  |  | $ (1,000,000)
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 | 8.9493% |  | 8.9493% |  |  | 8.611%
The net reduction in interest expense from interest rate swaps | $ 1,000,000 | $ 1,000,000 | $ 3,000,000 | $ 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 | $ 6,000,000 |  | $ 6,000,000 |  |  | $ 2,000,000
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% |  |  |

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