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Segments of Operations (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Segment Reporting Information, by Segment | The following tables (in millions) show AFG’s revenues and earnings before income taxes by segment and sub-segment.
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Revenues |  |  |  |  |  |  |
Property and casualty insurance: |  |  |  |  |  |  |
Premiums earned: |  |  |  |  |  |  |
Specialty |  |  |  |  |  |  |
Property and transportation | $ | 374 |  |  | $ | 357 |  |  | $ | 724 |  |  | $ | 699 |
Specialty casualty | 595 |  |  | 537 |  |  | 1,174 |  |  | 1,045 |
Specialty financial | 159 |  |  | 146 |  |  | 308 |  |  | 293 |
Other specialty | 33 |  |  | 25 |  |  | 62 |  |  | 50 |
Total premiums earned | 1,161 |  |  | 1,065 |  |  | 2,268 |  |  | 2,087 |
Net investment income | 115 |  |  | 96 |  |  | 215 |  |  | 182 |
Other income (a) | 2 |  |  | 4 |  |  | 4 |  |  | 20 |
Total property and casualty insurance | 1,278 |  |  | 1,165 |  |  | 2,487 |  |  | 2,289 |
Annuity: |  |  |  |  |  |  |
Net investment income | 412 |  |  | 360 |  |  | 806 |  |  | 707 |
Other income | 27 |  |  | 26 |  |  | 53 |  |  | 53 |
Total annuity | 439 |  |  | 386 |  |  | 859 |  |  | 760 |
Other | 85 |  |  | 87 |  |  | 168 |  |  | 162 |
Total revenues before realized gains (losses) | 1,802 |  |  | 1,638 |  |  | 3,514 |  |  | 3,211 |
Realized gains (losses) on securities | 31 |  |  | 8 |  |  | (62 | ) |  | 11 |
Total revenues | $ | 1,833 |  |  | $ | 1,646 |  |  | $ | 3,452 |  |  | $ | 3,222 |
Earnings Before Income Taxes |  |  |  |  |  |  |
Property and casualty insurance: |  |  |  |  |  |  |
Underwriting: |  |  |  |  |  |  |
Specialty |  |  |  |  |  |  |
Property and transportation | $ | 23 |  |  | $ | 21 |  |  | $ | 56 |  |  | $ | 64 |
Specialty casualty | 29 |  |  | 29 |  |  | 70 |  |  | 44 |
Specialty financial | 22 |  |  | 23 |  |  | 37 |  |  | 45 |
Other specialty | (1 | ) |  | — |  |  | 2 |  |  | (1 | )
Other lines | (1 | ) |  | (1 | ) |  | (2 | ) |  | (2 | )
Total underwriting | 72 |  |  | 72 |  |  | 163 |  |  | 150 |
Investment and other income, net (a) | 106 |  |  | 91 |  |  | 199 |  |  | 184 |
Total property and casualty insurance | 178 |  |  | 163 |  |  | 362 |  |  | 334 |
Annuity | 99 |  |  | 85 |  |  | 224 |  |  | 181 |
Other (b) | (48 | ) |  | (51 | ) |  | (90 | ) |  | (98 | )
Total earnings before realized gains (losses) and income taxes | 229 |  |  | 197 |  |  | 496 |  |  | 417 |
Realized gains (losses) on securities | 31 |  |  | 8 |  |  | (62 | ) |  | 11 |
Total earnings before income taxes | $ | 260 |  |  | $ | 205 |  |  | $ | 434 |  |  | $ | 428 |
(a) | Includes income of $13 million (before noncontrolling interest) from the sale of a hotel in the first quarter of 2017.
(b) | Includes holding company interest and expenses, including a $7 million loss on retirement of debt in the second quarter of 2017.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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