Investments (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Unrealized gain on:
Pretax	$ 1,162		$ 880
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(419)		(317)
Net	743	[1]	563	[1]	823	[1]	578
Fixed maturities - annuity segment [Member]
Unrealized gain on:
Pretax	1,157	[2]	729	[2]
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(405)	[2]	(255)	[2]
Net	752	[2]	474	[2]
Fixed maturities - all other [Member]
Unrealized gain on:
Pretax	503		361
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(185)		(133)
Net	318		228
Equity securities [Member]
Unrealized gain on:
Pretax	218		192
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(79)		(70)
Net	139		122
Deferred policy acquisition costs - annuity segment [Member]
Unrealized gain on:
Pretax	(531)		(345)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	186		121
Net	(345)		(224)
Annuity benefits accumulated [Member]
Unrealized gain on:
Pretax	(112)		(71)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	39		25
Net	(73)		(46)
Life, accident and health reserves [Member]
Unrealized gain on:
Pretax	(104)		(8)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	36		3
Net	(68)		(5)
Unearned revenue [Member]
Unrealized gain on:
Pretax	31		22
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(11)		(8)
Net	$ 20		$ 14

[1] Includes net unrealized gains of $58 million at December 31, 2014 compared to net unrealized gains of $54 million and $33 million at December 31, 2013 and 2012, 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.