Condensed Financial Information of Parent Company - Condensed Statement of Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Total revenues	$ 8,324	$ 7,827	$ 7,040
Costs and Expenses:
Interest charges on other borrowings	76	76	85
Other expenses	319	305	255
Total costs and expenses	7,200	6,754	5,917
Earnings before income taxes	1,124	1,073	1,123
Provision for income taxes	237	221	225
Net Earnings	887	852	898
AFG
Revenues:
Dividends from subsidiaries	841	903	879
Equity in undistributed earnings of subsidiaries	454	308	405
Investment and other income	28	60	28
Total revenues	1,323	1,271	1,312
Costs and Expenses:
Interest charges on intercompany borrowings	8	8	7
Interest charges on other borrowings	76	76	85
Other expenses	115	114	97
Total costs and expenses	199	198	189
Earnings before income taxes	1,124	1,073	1,123
Provision for income taxes	237	221	225
Net Earnings	$ 887	$ 852	$ 898