Investments (Details 4) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Unrealized gain on:
Pretax	$ 1,073		$ 880
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(388)		(317)
Net	685	[1]	563	[1]	865	823
Fixed maturities - annuity segment [Member]
Unrealized gain on:
Pretax	963	[2]	729	[2]
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(337)	[2]	(255)	[2]
Net	626	[2]	474	[2]
Fixed maturities - all other [Member]
Unrealized gain on:
Pretax	443		361
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(163)		(133)
Net	280		228
Equity securities [Member]
Unrealized gain on:
Pretax	205		192
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(76)		(70)
Net	129		122
Deferred policy acquisition costs - annuity segment [Member]
Unrealized gain on:
Pretax	(450)		(345)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	157		121
Net	(293)		(224)
Annuity benefits accumulated [Member]
Unrealized gain on:
Pretax	(97)		(71)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	34		25
Net	(63)		(46)
Life, accident and health reserves [Member]
Unrealized gain on:
Pretax	(20)		(8)
Deferred Tax and Amounts Attributable to Noncontrolling Interests	7		3
Net	(13)		(5)
Unearned revenue [Member]
Unrealized gain on:
Pretax	29		22
Deferred Tax and Amounts Attributable to Noncontrolling Interests	(10)		(8)
Net	$ 19		$ 14

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