Condensed Financial Information of Parent Company - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Cash and cash equivalents	$ 2,810	$ 2,314	$ 1,515	$ 2,338
Other investments	276	278
Other assets	1,626	1,867
Total assets	73,566	70,130	63,456
Liabilities and Equity:
Long-term debt	1,963	1,473
Other liabilities	2,197	2,295
Shareholders’ equity	6,789	6,269
Total liabilities and equity	73,566	70,130
AFG
Assets:
Cash and cash equivalents	215	166	$ 158	$ 299
Investment in securities	80	77
Investment in subsidiaries	8,525	7,623
Other investments	2	2
Other assets	213	143
Total assets	9,035	8,011
Liabilities and Equity:
Long-term debt	1,963	1,473
Other liabilities	283	269
Shareholders’ equity	6,789	6,269
Total liabilities and equity	$ 9,035	$ 8,011