Condensed Financial Information of Parent Company (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Assets:
Cash and cash equivalents	$ 1,639		$ 1,705		$ 1,324	$ 1,099
Total assets	42,087		39,171		35,838
Liabilities and Equity:
Long-term debt	913		953
Shareholders’ equity	4,599		4,578
Total liabilities and equity	42,087		39,171
AFG [Member]
Assets:
Cash and cash equivalents	523		279		415	370
Investment in securities	53		44
Investment in subsidiaries	5,041	[1]	5,155	[1]
Other investments	2		2
Other assets	108		117
Total assets	5,727		5,597
Liabilities and Equity:
Long-term debt	840		840
Other liabilities	288		179
Shareholders’ equity	4,599		4,578
Total liabilities and equity	$ 5,727		$ 5,597

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