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Investments - Components of the net unrealized gain on securities that is included in AOCI in the Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Unrealized gain on:    
Pretax $ 1,063 $ 622
Deferred Tax (223) (218)
Net 840 404
Total investments    
Unrealized gain on:    
Pretax 1,620 960
Deferred Tax (340) (336)
Net 1,280 624
Total fixed maturities    
Unrealized gain on:    
Pretax 1,341 809
Deferred Tax (282) (283)
Net 1,059 526
Fixed maturities — annuity segment    
Unrealized gain on:    
Pretax [1] 1,082 640
Deferred Tax [1] (227) (224)
Net [1] 855 416
Fixed maturities — all other    
Unrealized gain on:    
Pretax 259 169
Deferred Tax (55) (59)
Net 204 110
Equity securities    
Unrealized gain on:    
Pretax [2] 279 151
Deferred Tax [2] (58) (53)
Net [2] 221 98
Deferred policy acquisition costs — annuity segment    
Unrealized gain on:    
Pretax (433) (273)
Deferred Tax 91 96
Net (342) (177)
Annuity benefits accumulated    
Unrealized gain on:    
Pretax (137) (78)
Deferred Tax 29 27
Net (108) (51)
Unearned revenue    
Unrealized gain on:    
Pretax 13 13
Deferred Tax (3) (5)
Net $ 10 $ 8
[1] Net unrealized gains on fixed maturity investments supporting AFG’s annuity benefits accumulated.
[2] As discussed in Note A — “Accounting Policies — Investments,” effective January 1, 2018, all equity securities currently classified as “available for sale” will be required to be carried at fair value through net earnings instead of AOCI.