Investments (Details 4) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
Unrealized gain on:
Pretax	$ 1,249		$ 1,162
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(450)		(419)
Net	799	[1]	743	[1]	685	563
Fixed maturities - annuity segment [Member]
Unrealized gain on:
Pretax	1,349	[2]	1,157	[2]
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(472)	[2]	(405)	[2]
Net	877	[2]	752	[2]
Fixed maturities - all other [Member]
Unrealized gain on:
Pretax	529		503
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(196)		(185)
Net	333		318
Equity securities [Member]
Unrealized gain on:
Pretax	224		218
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(81)		(79)
Net	143		139
Deferred policy acquisition costs - annuity segment [Member]
Unrealized gain on:
Pretax	(601)		(531)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	210		186
Net	(391)		(345)
Annuity benefits accumulated [Member]
Unrealized gain on:
Pretax	(179)		(112)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	63		39
Net	(116)		(73)
Life, accident and health reserves [Member]
Unrealized gain on:
Pretax	(109)		(104)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	38		36
Net	(71)		(68)
Unearned revenue [Member]
Unrealized gain on:
Pretax	36		31
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(12)		(11)
Net	$ 24		$ 20

[1] Includes net unrealized gains of $57 million at March 31, 2015 compared to $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.