Investments - Components of the net unrealized gain on securities that is included in AOCI in the Balance Sheet (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Unrealized gain on:
Pretax		$ 1,304	$ 1,091
Deferred Tax		(274)	(229)
Net		1,030	862
Total fixed maturities
Unrealized gain on:
Pretax		2,437	1,981
Deferred Tax		(512)	(416)
Net		1,925	1,565
Fixed maturities — annuity segment
Unrealized gain on:
Pretax	[1]	2,031	1,611
Deferred Tax	[1]	(427)	(338)
Net	[1]	1,604	1,273
Fixed maturities — all other
Unrealized gain on:
Pretax		406	370
Deferred Tax		(85)	(78)
Net		321	292
Deferred policy acquisition costs — annuity segment
Unrealized gain on:
Pretax		(877)	(681)
Deferred Tax		184	143
Net		(693)	(538)
Annuity benefits accumulated
Unrealized gain on:
Pretax		(269)	(219)
Deferred Tax		57	46
Net		(212)	(173)
Life, accident and health reserves
Unrealized gain on:
Pretax		(1)	(1)
Deferred Tax		0	0
Net		(1)	(1)
Unearned revenue
Unrealized gain on:
Pretax		14	11
Deferred Tax		(3)	(2)
Net		$ 11	$ 9

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