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Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Available for sale fixed maturities | Available for sale fixed maturities at March 31, 2018 and December 31, 2017, consisted of the following (in millions):
| March 31, 2018 |  | December 31, 2017
Amortized Cost |  | Gross Unrealized |  | Net Unrealized |  | Fair Value |  | Amortized Cost |  | Gross Unrealized |  | Net Unrealized |  | Fair Value
Gains |  | Losses |  | Gains |  | Losses
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and government agencies | $ | 253 |  |  | $ | 1 |  |  | $ | (4 | ) |  | $ | (3 | ) |  | $ | 250 |  |  | $ | 244 |  |  | $ | 1 |  |  | $ | (3 | ) |  | $ | (2 | ) |  | $ | 242 |
States, municipalities and political subdivisions | 6,855 |  |  | 187 |  |  | (39 | ) |  | 148 |  |  | 7,003 |  |  | 6,887 |  |  | 254 |  |  | (18 | ) |  | 236 |  |  | 7,123 |
Foreign government | 130 |  |  | 2 |  |  | — |  |  | 2 |  |  | 132 |  |  | 124 |  |  | 3 |  |  | — |  |  | 3 |  |  | 127 |
Residential MBS | 2,732 |  |  | 338 |  |  | (7 | ) |  | 331 |  |  | 3,063 |  |  | 2,884 |  |  | 349 |  |  | (6 | ) |  | 343 |  |  | 3,227 |
Commercial MBS | 922 |  |  | 21 |  |  | (3 | ) |  | 18 |  |  | 940 |  |  | 927 |  |  | 36 |  |  | (1 | ) |  | 35 |  |  | 962 |
Asset-backed securities | 8,546 |  |  | 148 |  |  | (31 | ) |  | 117 |  |  | 8,663 |  |  | 7,836 |  |  | 142 |  |  | (16 | ) |  | 126 |  |  | 7,962 |
Corporate and other | 18,945 |  |  | 308 |  |  | (179 | ) |  | 129 |  |  | 19,074 |  |  | 18,136 |  |  | 638 |  |  | (38 | ) |  | 600 |  |  | 18,736 |
Total fixed maturities | $ | 38,383 |  |  | $ | 1,005 |  |  | $ | (263 | ) |  | $ | 742 |  |  | $ | 39,125 |  |  | $ | 37,038 |  |  | $ | 1,423 |  |  | $ | (82 | ) |  | $ | 1,341 |  |  | $ | 38,379 |
Equity securities reported at fair value | Equity securities reported at fair value consisted of the following at March 31, 2018 (in millions):
|  |  |  |  | Fair Value in
| Actual Cost |  | Fair Value |  | excess of Cost
Common stocks | $ | 1,099 |  |  | $ | 1,154 |  |  | $ | 55 |
Perpetual preferred stocks | 632 |  |  | 632 |  |  | — |
Total equity securities carried at fair value | $ | 1,731 |  |  | $ | 1,786 |  |  | $ | 55 |
Available for sale securities in a continuous unrealized loss position | The following tables show gross unrealized losses (dollars in millions) on available for sale fixed maturities and equity securities by investment category and length of time that individual securities have been in a continuous unrealized loss position at the following balance sheet dates.
| Less Than Twelve Months |  | Twelve Months or More
Unrealized Loss |  | Fair Value |  | Fair Value as % of Cost |  | Unrealized Loss |  | Fair Value |  | Fair Value as % of Cost
March 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |
U.S. Government and government agencies | $ | (1 | ) |  | $ | 57 |  |  | 98 | % |  | $ | (3 | ) |  | $ | 119 |  |  | 98 | %
States, municipalities and political subdivisions | (26 | ) |  | 1,745 |  |  | 99 | % |  | (13 | ) |  | 411 |  |  | 97 | %
Foreign government | — |  |  | 22 |  |  | 100 | % |  | — |  |  | — |  |  | — | %
Residential MBS | (3 | ) |  | 155 |  |  | 98 | % |  | (4 | ) |  | 114 |  |  | 97 | %
Commercial MBS | (3 | ) |  | 148 |  |  | 98 | % |  | — |  |  | — |  |  | — | %
Asset-backed securities | (21 | ) |  | 2,586 |  |  | 99 | % |  | (10 | ) |  | 306 |  |  | 97 | %
Corporate and other | (149 | ) |  | 7,352 |  |  | 98 | % |  | (30 | ) |  | 601 |  |  | 95 | %
Total fixed maturities | $ | (203 | ) |  | $ | 12,065 |  |  | 98 | % |  | $ | (60 | ) |  | $ | 1,551 |  |  | 96 | %
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |
U.S. Government and government agencies | $ | — |  |  | $ | 55 |  |  | 100 | % |  | $ | (3 | ) |  | $ | 123 |  |  | 98 | %
States, municipalities and political subdivisions | (8 | ) |  | 825 |  |  | 99 | % |  | (10 | ) |  | 431 |  |  | 98 | %
Foreign government | — |  |  | 4 |  |  | 100 | % |  | — |  |  | — |  |  | — | %
Residential MBS | (1 | ) |  | 118 |  |  | 99 | % |  | (5 | ) |  | 118 |  |  | 96 | %
Commercial MBS | (1 | ) |  | 67 |  |  | 99 | % |  | — |  |  | — |  |  | — | %
Asset-backed securities | (7 | ) |  | 1,195 |  |  | 99 | % |  | (9 | ) |  | 299 |  |  | 97 | %
Corporate and other | (20 | ) |  | 2,031 |  |  | 99 | % |  | (18 | ) |  | 603 |  |  | 97 | %
Total fixed maturities | $ | (37 | ) |  | $ | 4,295 |  |  | 99 | % |  | $ | (45 | ) |  | $ | 1,574 |  |  | 97 | %
Equity securities: |  |  |  |  |  |  |  |  |  |  |
Common stocks | $ | (22 | ) |  | $ | 117 |  |  | 84 | % |  | $ | — |  |  | $ | — |  |  | — | %
Perpetual preferred stocks | — |  |  | 41 |  |  | 100 | % |  | (1 | ) |  | 13 |  |  | 93 | %
Total equity securities | $ | (22 | ) |  | $ | 158 |  |  | 88 | % |  | $ | (1 | ) |  | $ | 13 |  |  | 93 | %
Roll forward of cumulative credit portion of other-than-temporary impairments on fixed maturity securities | A progression of the credit portion of other-than-temporary impairments on fixed maturity securities for which the non-credit portion of an impairment has been recognized in other comprehensive income is shown below (in millions):
| 2018 |  | 2017
Balance at January 1 | $ | 145 |  |  | $ | 153 |
Additional credit impairments on: |  |  |
Previously impaired securities | — |  |  | — |
Securities without prior impairments | — |  |  | — |
Reductions due to sales or redemptions | (1 | ) |  | (7 | )
Balance at March 31 | $ | 144 |  |  | $ | 146 |
Available for sale fixed maturity securities by contractual maturity date | The table below sets forth the scheduled maturities of available for sale fixed maturities as of March 31, 2018 (dollars in millions). Securities with sinking funds are reported at average maturity. Actual maturities may differ from contractual maturities because certain securities may be called or prepaid by the issuers.
| Amortized |  | Fair Value
Cost |  | Amount |  | %
Maturity |  |  |  |  |
One year or less | $ | 793 |  |  | $ | 804 |  |  | 2 | %
After one year through five years | 7,314 |  |  | 7,431 |  |  | 19 | %
After five years through ten years | 13,345 |  |  | 13,425 |  |  | 35 | %
After ten years | 4,731 |  |  | 4,799 |  |  | 12 | %
| 26,183 |  |  | 26,459 |  |  | 68 | %
ABS (average life of approximately 4-1/2 years) | 8,546 |  |  | 8,663 |  |  | 22 | %
MBS (average life of approximately 4-1/2 years) | 3,654 |  |  | 4,003 |  |  | 10 | %
Total | $ | 38,383 |  |  | $ | 39,125 |  |  | 100 | %
Components of the net unrealized gain on securities, included in Accumulated Other Comprehensive Income | The following table shows (in millions) the components of the net unrealized gain on securities that is included in AOCI in AFG’s Balance Sheet.
| Pretax |  | Deferred Tax |  | Net
March 31, 2018 |  |  |  |  |
Net unrealized gain on: |  |  |  |  |
Fixed maturities — annuity segment (a) | $ | 594 |  |  | $ | (125 | ) |  | $ | 469 |
Fixed maturities — all other | 148 |  |  | (31 | ) |  | 117 |
Total fixed maturities | 742 |  |  | (156 | ) |  | 586 |
Deferred policy acquisition costs — annuity segment | (236 | ) |  | 49 |  |  | (187 | )
Annuity benefits accumulated | (79 | ) |  | 17 |  |  | (62 | )
Unearned revenue | 6 |  |  | (1 | ) |  | 5 |
Total net unrealized gain on marketable securities | $ | 433 |  |  | $ | (91 | ) |  | $ | 342 |
December 31, 2017 |  |  |  |  |
Net unrealized gain on: |  |  |  |  |
Fixed maturities — annuity segment (a) | $ | 1,082 |  |  | $ | (227 | ) |  | $ | 855 |
Fixed maturities — all other | 259 |  |  | (55 | ) |  | 204 |
Total fixed maturities | 1,341 |  |  | (282 | ) |  | 1,059 |
Equity securities (b) | 279 |  |  | (58 | ) |  | 221 |
Total investments | 1,620 |  |  | (340 | ) |  | 1,280 |
Deferred policy acquisition costs — annuity segment | (433 | ) |  | 91 |  |  | (342 | )
Annuity benefits accumulated | (137 | ) |  | 29 |  |  | (108 | )
Unearned revenue | 13 |  |  | (3 | ) |  | 10 |
Total net unrealized gain on marketable securities | $ | 1,063 |  |  | $ | (223 | ) |  | $ | 840 |
(a) | Net unrealized gains on fixed maturity investments supporting AFG’s annuity benefits accumulated.
(b) | 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.
Net investment income earned and investment expenses incurred | The following table shows (in millions) investment income earned and investment expenses incurred.
| Three months ended March 31,
| 2018 |  | 2017
Investment income: |  |  |
Fixed maturities | $ | 412 |  |  | $ | 389 |
Equity securities | 19 |  |  | 21 |
Equity in earnings of partnerships and similar investments | 46 |  |  | 10 |
Other | 23 |  |  | 20 |
Gross investment income | 500 |  |  | 440 |
Investment expenses | (5 | ) |  | (5 | )
Net investment income | $ | 495 |  |  | $ | 435 |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments | Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments are summarized as follows (in millions):
| Three months ended March 31, 2018 |  | Three months ended March 31, 2017
| Realized gains (losses) |  |  |  | Realized gains (losses) |  |
| Before Impairments |  | Impairments |  | Total |  | Change in Unrealized |  | Before Impairments |  | Impairments |  | Total |  | Change in Unrealized
Fixed maturities | $ | (1 | ) |  | $ | (1 | ) |  | $ | (2 | ) |  | $ | (599 | ) |  | $ | 5 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 202 |
Equity securities (a) | (95 | ) |  | — |  |  | (95 | ) |  | — |  |  | 2 |  |  | (9 | ) |  | (7 | ) |  | 72 |
Mortgage loans and other investments | — |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |  |  | — |
Other (b) | 4 |  |  | — |  |  | 4 |  |  | 248 |  |  | (1 | ) |  | 3 |  |  | 2 |  |  | (83 | )
Total pretax | (92 | ) |  | (1 | ) |  | (93 | ) |  | (351 | ) |  | 9 |  |  | (6 | ) |  | 3 |  |  | 191 |
Tax effects | 20 |  |  | — |  |  | 20 |  |  | 74 |  |  | (3 | ) |  | 2 |  |  | (1 | ) |  | (66 | )
Net of tax | $ | (72 | ) |  | $ | (1 | ) |  | $ | (73 | ) |  | $ | (277 | ) |  | $ | 6 |  |  | $ | (4 | ) |  | $ | 2 |  |  | $ | 125 |
(a) | 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. AFG recorded a net realized loss of $94 million on equity securities during the first three months of 2018 on securities that were still owned at March 31, 2018.
(b) | Primarily adjustments to deferred policy acquisition costs and reserves related to the annuity business.
Gross realized gains and losses on available for sale fixed maturity and equity security investments | Gross realized gains and losses (excluding impairment write-downs and mark-to-market of derivatives) on available for sale fixed maturity investment transactions consisted of the following (in millions):
| Three months ended March 31,
2018 |  | 2017
Fixed maturities: |  |  |
Gross gains | $ | 6 |  |  | $ | 5 |
Gross losses | (3 | ) |  | — |

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