Condensed Financial Information of Parent Company - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets:
Cash and cash equivalents	$ 1,406	$ 1,225
Real estate and other investments	153	129
Other assets	1,375	1,346
Total assets	30,836	29,787
Liabilities and Equity:
Long-term debt	1,475	1,475
Other liabilities	1,976	2,023
Equity attributable to parent	4,466	4,258
Total liabilities and shareholders’ equity	30,836	29,787
AFG
Assets:
Cash and cash equivalents	283	268	$ 225	$ 589
Investment in securities	42	154
Investment in subsidiaries	5,681	5,396
Real estate and other investments	64	63
Other assets	219	189
Total assets	6,289	6,070
Liabilities and Equity:
Long-term debt	1,475	1,475
Other liabilities	348	337
Equity attributable to parent	4,466	4,258
Total liabilities and shareholders’ equity	$ 6,289	$ 6,070