Investments (Details 4) - USD ($) $ in Millions		Sep. 30, 2015		Jun. 30, 2015	[1]	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Unrealized gain on:
Pretax		$ 764				$ 1,162
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(275)				(419)
Net		489	[1]	$ 587		743	[1]	$ 726	$ 805	$ 563
Fixed maturities - annuity segment [Member]
Unrealized gain on:
Pretax	[2]	868				1,157
Deferred Tax and Amounts Attributable to Noncontrolling Interests	[2]	(304)				(405)
Net	[2]	564				752
Fixed maturities - all other [Member]
Unrealized gain on:
Pretax		378				503
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(140)				(185)
Net		238				318
Equity securities [Member]
Unrealized gain on:
Pretax		68				218
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(24)				(79)
Net		44				139
Deferred policy acquisition costs - annuity segment [Member]
Unrealized gain on:
Pretax		(391)				(531)
Deferred Tax and Amounts Attributable to Noncontrolling Interests		137				186
Net		(254)				(345)
Annuity benefits accumulated [Member]
Unrealized gain on:
Pretax		(112)				(112)
Deferred Tax and Amounts Attributable to Noncontrolling Interests		39				39
Net		(73)				(73)
Life, accident and health reserves [Member]
Unrealized gain on:
Pretax		(67)				(104)
Deferred Tax and Amounts Attributable to Noncontrolling Interests		24				36
Net		(43)				(68)
Unearned revenue [Member]
Unrealized gain on:
Pretax		20				31
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(7)				(11)
Net		$ 13				$ 20

[1] Includes net unrealized gains of $53 million at September 30, 2015, $57 million at June 30, 2015 and $58 million at December 31, 2014 related to securities for which only the credit portion of an other-than-temporary impairment has been recorded in earnings.

[2] Unrealized gains on fixed maturity investments supporting AFG’s annuity benefits accumulated.