Goodwill and Other Intangibles	9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	Goodwill and Other IntangiblesThere were no changes in the goodwill balance from AFG’s continuing operations of $176 million during the first nine months of 2021.Included in other assets in AFG’s Balance Sheet is $29 million at September 30, 2021 and $34 million at December 31, 2020 in amortizable intangible assets related to property and casualty insurance acquisitions. These amounts are net of accumulated amortization of $66 million and $62 million, respectively. Amortization of intangibles was $1 million and $3 million in the third quarter of 2021 and 2020, respectively, and $5 million and $9 million in the first nine months of 2021 and 2020, respectively.

Goodwill and Other Intangibles

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other IntangiblesThere were no changes in the goodwill balance from AFG’s continuing operations of $176 million during the first nine months of 2021.Included in other assets in AFG’s Balance Sheet is $29 million at September 30, 2021 and $34 million at December 31, 2020 in amortizable intangible assets related to property and casualty insurance acquisitions. These amounts are net of accumulated amortization of $66 million and $62 million, respectively. Amortization of intangibles was $1 million and $3 million in the third quarter of 2021 and 2020, respectively, and $5 million and $9 million in the first nine months of 2021 and 2020, respectively.