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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 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Unrealized gain on: |  |  |
Pretax |  | $ 118 | $ 1,063
Deferred Tax |  | (25) | (223)
Net |  | 93 | 840
Total investments |  |  |
Unrealized gain on: |  |  |
Pretax |  |  | 1,620
Deferred Tax |  |  | (340)
Net |  |  | 1,280
Total fixed maturities |  |  |
Unrealized gain on: |  |  |
Pretax |  | 191 | 1,341
Deferred Tax |  | (40) | (282)
Net |  | 151 | 1,059
Fixed maturities — annuity segment |  |  |
Unrealized gain on: |  |  |
Pretax | [1] | 143 | 1,082
Deferred Tax | [1] | (30) | (227)
Net | [1] | 113 | 855
Fixed maturities — all other |  |  |
Unrealized gain on: |  |  |
Pretax |  | 48 | 259
Deferred Tax |  | (10) | (55)
Net |  | 38 | 204
Equity securities |  |  |
Unrealized gain on: |  |  |
Pretax | [2] |  | 279
Deferred Tax | [2] |  | (58)
Net | [2] |  | 221
Deferred policy acquisition costs — annuity segment |  |  |
Unrealized gain on: |  |  |
Pretax |  | (56) | (433)
Deferred Tax |  | 12 | 91
Net |  | (44) | (342)
Annuity benefits accumulated |  |  |
Unrealized gain on: |  |  |
Pretax |  | (18) | (137)
Deferred Tax |  | 3 | 29
Net |  | (15) | (108)
Unearned revenue |  |  |
Unrealized gain on: |  |  |
Pretax |  | 1 | 13
Deferred Tax |  | 0 | (3)
Net |  | $ 1 | $ 10
[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 other than those accounted for under the equity method are carried at fair value through net earnings.

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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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- Definition unrealized gain on securities, included in Accumulated Other Comprehensive Income. + References No definition available. + Details
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