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Fair Value Measurements - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2019 USD ($) basispoint stock security | Jun. 30, 2018 USD ($) stock | Mar. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) basispoint stock professional security | Jun. 30, 2018 USD ($) stock | Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
AFG's internal investment professionals | professional |  |  |  | 20 |  |
Level 3 assets as a percentage of total assets measured at fair value |  |  |  | 6.00% |  |
Percentage of level 3 assets that were priced using non-binding broker quotes |  |  |  | 55.00% |  |
Level 3 assets that were priced using non-binding broker quotes |  |  |  | $ 1,710 |  |
Percent of spreads between 400 and 700 basis points | 80.00% |  |  | 80.00% |  |
Fair value of equity securities transferred into Level 3 | $ 41 | $ 51 |  | $ 57 | $ 87 |
Total realized/unrealized gains (losses) included in net income for the embedded derivatives related to unlocking of actuarial assumptions |  |  |  |  | $ 44 |
Life contingent annuities | 238 |  |  | $ 238 |  | $ 232
Fixed-indexed and variable-indexed annuities (embedded derivative), majority of future years | Minimum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unobservable input surrenders used in Level 3 fair value determination |  |  |  | 7.00% |  |
Fixed-indexed and variable-indexed annuities (embedded derivative), majority of future years | Maximum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unobservable input surrenders used in Level 3 fair value determination |  |  |  | 11.00% |  |
Fixed-indexed and variable-indexed annuities (embedded derivative) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of derivatives in annuity benefits accumulated measured using a discounted cash flow approach | 3,540 |  |  | $ 3,540 |  |
Fixed-indexed and variable-indexed annuities (embedded derivative) | Minimum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unobservable input surrenders used in Level 3 fair value determination |  |  |  | 4.00% |  |
Fixed-indexed and variable-indexed annuities (embedded derivative) | Maximum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unobservable input surrenders used in Level 3 fair value determination |  |  |  | 23.00% |  |
Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Internally developed level 3 assets | $ 1,190 |  |  | $ 1,190 |  |
Perpetual preferred stocks |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Number of stocks transferred from Level 1 to Level 2 | stock | 1 | 2 |  | 1 | 2 |
Fair Value of assets transferred Level 1 to Level 2, during the first six months | $ 6 | $ 6 |  | $ 6 | $ 6 |
Fair Value of assets transferred Level 1 to Level 2, during the second quarter | 6 | 6 |  | 6 | 6 |
Fixed maturities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of equity securities transferred into Level 3 | 35 | 50 |  | 35 | 57 |
Equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of equity securities transferred into Level 3 | 6 | 1 | $ 29 | 22 | 30 |
Third party pricing model | Fixed maturities | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Internally developed level 3 assets | $ 833 |  |  | $ 833 |  |
Securities priced using a third-party model | security | 140 |  |  | 140 |  |
Basis points credit spread applied by management using third party model | basispoint | 576 |  |  | 576 |  |
Third party pricing model | Fixed maturities | Level 3 | Minimum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Basis points credit spread applied by management using third party model | basispoint | 400 |  |  | 400 |  |
Third party pricing model | Fixed maturities | Level 3 | Maximum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Basis points credit spread applied by management using third party model | basispoint | 700 |  |  | 700 |  |
Not Designated as Hedging Instrument | Annuity benefits | Fixed-Indexed Annuities (Embedded Derivative) [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total realized/unrealized gains (losses) included in net income for the embedded derivatives related to unlocking of actuarial assumptions |  | $ 44 |  |  | $ 44 |
Credit spread used in pricing model | Third party pricing model | Fixed maturities | Level 3 | Minimum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Basis points credit spread applied by management using third party model | basispoint | 100 |  |  | 100 |  |
Credit spread used in pricing model | Third party pricing model | Fixed maturities | Level 3 | Maximum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Basis points credit spread applied by management using third party model | basispoint | 2,966 |  |  | 2,966 |  |

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