Investments (Details 4) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Unrealized gain on:
Pretax		$ 1,069	$ 517
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(384)	(185)
Net		685	332
Total investments [Member]
Unrealized gain on:
Pretax		1,828	803
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(650)	(285)
Net		1,178	518
Fixed maturities [Member]
Unrealized gain on:
Pretax		1,756	719
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(624)	(255)
Net		1,132	464
Fixed maturities - annuity segment [Member]
Unrealized gain on:
Pretax	[1]	1,416	523
Deferred Tax and Amounts Attributable to Noncontrolling Interests	[1]	(495)	(183)
Net	[1]	921	340
Fixed maturities - all other [Member]
Unrealized gain on:
Pretax		340	196
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(129)	(72)
Net		211	124
Equity securities [Member]
Unrealized gain on:
Pretax		72	84
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(26)	(30)
Net		46	54
Deferred policy acquisition costs - annuity segment [Member]
Unrealized gain on:
Pretax		(602)	(233)
Deferred Tax and Amounts Attributable to Noncontrolling Interests		211	82
Net		(391)	(151)
Annuity benefits accumulated [Member]
Unrealized gain on:
Pretax		(185)	(64)
Deferred Tax and Amounts Attributable to Noncontrolling Interests		65	22
Net		(120)	(42)
Life, accident and health reserves [Member]
Unrealized gain on:
Pretax		(2)
Deferred Tax and Amounts Attributable to Noncontrolling Interests		1
Net		(1)
Unearned revenue [Member]
Unrealized gain on:
Pretax		30	11
Deferred Tax and Amounts Attributable to Noncontrolling Interests		(11)	(4)
Net		$ 19	$ 7

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