Condensed Financial Information of Parent Company (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Total revenues	$ 1,362	$ 1,443	$ 1,139	$ 1,148	$ 1,208	$ 1,538	$ 1,124	$ 1,087	$ 5,092	$ 4,957	$ 4,643
Costs and Expenses:
Other expenses									326	326	296
Total costs and expenses									4,403	4,420	4,085
Earnings before income taxes									689	537	558
Provision for income taxes									236	135	239
Net Earnings Attributable to Shareholders	158	83	110	120	50	226	99	113	471	488	342
AFG [Member]
Revenues:
Dividends from subsidiaries									606	433	544
Equity in undistributed earnings of subsidiaries									260	325	164
Investment and other income									8	5	2
Total revenues									874	763	710
Costs and Expenses:
Interest charges on intercompany borrowings									10	11	11
Interest charges on other borrowings									67	61	53
Other expenses									90	68	65
Total costs and expenses									167	140	129
Earnings before income taxes									707	623	581
Provision for income taxes									236	135	239
Net Earnings Attributable to Shareholders									$ 471	$ 488	$ 342