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Goodwill and Other Intangibles	9 Months Ended
	Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	Goodwill and Other Intangibles The carrying value of goodwill was $327 million at September 30, 2025 and $305 million at December 31, 2024, an increase of $22 million due to the July 2025 acquisition of Radion (see Note B — “Acquisition of Business”). Included in other assets in AFG’s Balance Sheet is $192 million at September 30, 2025 and $203 million at December 31, 2024 of amortizable intangible assets related to acquisitions. These amounts are net of accumulated amortization of $69 million and $59 million, respectively. Amortization of intangibles was $5 million in both the third quarter of 2025 and 2024 and $15 million and $14 million in the first nine months of 2025 and 2024, respectively. In the third quarter of 2025, AFG wrote off $2 million of amortizable intangible assets that became obsolete in connection with certain changes in AFG’s business. This write-off is included in realized gains (losses) on subsidiaries in AFG’s Statement of Earnings.

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- References

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- Definition

The entire disclosure for goodwill and intangible assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/350-30/tableOfContent

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/350-20/tableOfContent

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