Condensed Financial Information of Parent Company (Details 1) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Total revenues	$ 1,626	$ 1,684	$ 1,541	$ 1,294	$ 1,549	$ 1,581	$ 1,392	$ 1,211	$ 6,145	$ 5,733	$ 5,103
Costs and Expenses:
Other expenses									337	281	326
Total costs and expenses									5,580	5,107	4,414
Earnings before income taxes									565	626	689
Provision for income taxes									195	220	236
Net Earnings Attributable to Shareholders	$ 129	$ 63	$ 141	$ 19	$ 127	$ 116	$ 106	$ 103	352	452	471
AFG [Member]
Revenues:
Dividends from subsidiaries									311	480	606
Equity in undistributed earnings of subsidiaries									386	332	260
Investment and other income									4	5	8
Total revenues									701	817	874
Costs and Expenses:
Interest charges on intercompany borrowings									9	10	10
Interest charges on other borrowings									72	69	67
Other expenses									73	66	90
Total costs and expenses									154	145	167
Earnings before income taxes									547	672	707
Provision for income taxes									195	220	236
Net Earnings Attributable to Shareholders									$ 352	$ 452	$ 471