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Derivatives - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) swap | Dec. 31, 2017 USD ($) swap | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 11, 2017 | Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Carrying value of collateral received to support purchased call options | $ 389,000,000 | $ 389,000,000 | $ 380,000,000 |  |  |
Senior Notes | 9-7/8% Senior Notes due June 2019 |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Stated interest rate, percentage | 9.875% | 9.875% |  |  |  | 9.875%
AFG |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Interest rate description of fair value hedge activity |  | three-month LIBOR plus 8.099% |  |  |  |
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% |  | 9.875% | 9.875%
Not Designated as Hedging Instrument | Fixed-indexed annuities (embedded derivative) | Annuity benefits |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
The portion of the change in fair value of the embedded derivative related to the unlocking of actuarial assumptions |  | $ (25,000,000) | $ (17,000,000) | $ (28,000,000) |  |
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional amount of derivative instrument outstanding | $ 1,580,000,000.00 | $ 1,580,000,000.00 | 1,080,000,000.00 |  |  |
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Number of interest rate swaps designated and qualifying as a cash flow hedges | swap | 10 | 10 |  |  |  |
Number of interest rate swaps entered into during the period | swap |  | 3 |  |  |  |
Gain (loss) reclassified from AOCI into net investment income |  | $ 6,000,000 | 7,000,000 | 6,000,000 |  |
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings |  | 0 | 0 | 0 |  |
Collateral receivable supporting interest rate swaps | $ 70,000,000 | 70,000,000 | 60,000,000 |  |  |
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Other assets |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net derivatives, at fair value |  |  | 1,000,000 |  |  |
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Other assets | Maximum |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net derivatives, at fair value | 1,000,000 | 1,000,000 |  |  |  |
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Other liabilities |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net derivatives, at fair value | (31,000,000) | (31,000,000) | (22,000,000) |  |  |
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | New interest rate swaps entered into during the period |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional amount of derivative instrument outstanding | 663,000,000 | 663,000,000 |  |  |  |
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedge | AFG |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
The net reduction in interest expense from interest rate swaps |  | $ 2,000,000 | 3,000,000 | $ 2,000,000 |  |
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedge | AFG | Senior Notes | 9-7/8% Senior Notes due June 2019 |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Settlement of interest rate swap included in the loss on the retirement of debt | $ (1,000,000) |  |  |  |  |
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedge | AFG | LIBOR |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  | 8.099% |
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedge | Long-term debt | AFG |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net derivatives, at fair value |  |  | $ 1,000,000 |  |  |

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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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- 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=84234895&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=84234895&loc=SL5624177-113959 + 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=84234895&loc=SL5624171-113959 + Details
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