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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 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Unrealized gain on: |  |  |
Pretax |  | $ 433 | $ 1,063
Deferred Tax |  | (91) | (223)
Net |  | 342 | 840
Total investments |  |  |
Unrealized gain on: |  |  |
Pretax |  |  | 1,620
Deferred Tax |  |  | (340)
Net |  |  | 1,280
Total fixed maturities |  |  |
Unrealized gain on: |  |  |
Pretax |  | 742 | 1,341
Deferred Tax |  | (156) | (282)
Net |  | 586 | 1,059
Fixed maturities — annuity segment |  |  |
Unrealized gain on: |  |  |
Pretax | [1] | 594 | 1,082
Deferred Tax | [1] | (125) | (227)
Net | [1] | 469 | 855
Fixed maturities — all other |  |  |
Unrealized gain on: |  |  |
Pretax |  | 148 | 259
Deferred Tax |  | (31) | (55)
Net |  | 117 | 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 |  | (236) | (433)
Deferred Tax |  | 49 | 91
Net |  | (187) | (342)
Annuity benefits accumulated |  |  |
Unrealized gain on: |  |  |
Pretax |  | (79) | (137)
Deferred Tax |  | 17 | 29
Net |  | (62) | (108)
Unearned revenue |  |  |
Unrealized gain on: |  |  |
Pretax |  | 6 | 13
Deferred Tax |  | (1) | (3)
Net |  | $ 5 | $ 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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