Condensed Financial Information of Parent Company - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets:
Cash and cash equivalents	$ 1,225	$ 872
Real estate and other investments	129	127
Other assets	1,346	1,219
Total assets	29,787	28,831
Liabilities and Equity:
Long-term debt	1,475	1,496
Other liabilities	2,023	1,696
Equity attributable to parent	4,258	4,052
Total liabilities and shareholders’ equity	29,787	28,831
AFG
Assets:
Cash and cash equivalents	268	225	$ 589	$ 215
Investment in securities	154	591
Investment in subsidiaries	5,396	4,825
Real estate and other investments	63	63
Other assets	189	132
Total assets	6,070	5,836
Liabilities and Equity:
Long-term debt	1,475	1,496
Other liabilities	337	288
Equity attributable to parent	4,258	4,052
Total liabilities and shareholders’ equity	$ 6,070	$ 5,836