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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.

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- Definition Accumulated other comprehensive income loss available for sale securities adjustment deferred tax and non controlling interest. + References No definition available. + Details
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- Definition Accumulated other comprehensive income loss available for sale securities adjustment, pretax. + References No definition available. + Details
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