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Fair Value Measurements - Narrative (Details)
$ in Millions
Sep. 30, 2025
USD ($)
professional
Fair Value Disclosures [Abstract]  
AFG's internal investment professionals | professional 20
Level 3 assets as a percentage of total assets measured at fair value 7.00%
Percentage of internally developed level 3 assets compared to total level 3 assets 86.00%
Internally developed level 3 assets $ 867
Percentage of level 3 assets that were priced using a discounted cash flow approach 67.00%
Level 3 assets that were priced using a discounted cash flow approach $ 584
Level 3 assets that were priced using unobservable internal models and third party inputs $ 283
Percentage of level 3 assets that were priced using financial information from third parties 12.00%
Level 3 assets that were priced using financial information from third parties $ 120
Percentage of level 3 assets that were priced using non-binding broker quotes or pricing services 2.00%
Level 3 assets that were priced using non-binding broker quotes or pricing services $ 17