Segments of Operations (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total assets		$ 49,859	$ 47,535	$ 42,087
Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	14,689	14,069	11,717
Annuity [Member]
Segment Reporting Information [Line Items]
Total assets		29,865	27,317	24,294
Run-off Long-term Care and Life [Member]
Segment Reporting Information [Line Items]
Total assets	[2]	772	2,489	2,408
Other [Member]
Segment Reporting Information [Line Items]
Total assets		$ 4,533	$ 3,660	$ 3,668

[1] Not allocable to sub-segments.

[2] AFG sold substantially all of its run-off long-term care insurance business in December 2015.