Condensed Financial Information of Parent Company (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Cash and cash equivalents		$ 1,220	$ 1,343	$ 1,639	$ 1,705
Total assets		49,859	47,535	42,087
Liabilities and Equity:
Long-term debt		1,020	1,061
Shareholders’ equity		4,592	4,879
Total liabilities and equity		49,859	47,535
AFG [Member]
Assets:
Cash and cash equivalents		189	292	$ 523	$ 279
Investment in securities		63	58
Investment in subsidiaries	[1]	5,439	5,638
Other investments		2	2
Other assets		106	103
Total assets		5,799	6,093
Liabilities and Equity:
Long-term debt		1,008	990
Other liabilities		199	224
Shareholders’ equity		4,592	4,879
Total liabilities and equity		$ 5,799	$ 6,093

[1] Investment in subsidiaries includes intercompany receivables and payables.