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Segments of Operations | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segments of Operations | Segments of Operations AFG manages its business as four segments: (i) Property and casualty insurance, (ii) Annuity, (iii) Run-off long-term care and life and (iv) Other, which includes holding company assets and costs, and the assets and operations attributable to the noncontrolling interests of the managed investment entities. AFG reports its property and casualty insurance business in the following Specialty sub-segments: (i) Property and transportation, which includes physical damage and liability coverage for buses, trucks and recreational vehicles, inland and ocean marine, agricultural-related products and other property coverages, (ii) Specialty casualty, which includes primarily excess and surplus, general liability, executive liability, professional liability, umbrella and excess liability, specialty coverage in targeted markets, customized programs for small to mid-sized businesses and workers’ compensation insurance, and (iii) Specialty financial, which includes risk management insurance programs for leasing and financing institutions (including collateral and lender-placed mortgage property insurance), surety and fidelity products and trade credit insurance. Premiums and underwriting profit included under Other specialty represent business assumed by AFG’s internal reinsurance program from the operations that make up AFG’s other Specialty sub-segments and amortization of deferred gains on retroactive reinsurance transactions related to the sales of businesses in prior years. AFG’s annuity business markets traditional fixed and fixed-indexed annuities in the retail, financial institutions and education markets. AFG’s reportable segments and their components were determined based primarily upon similar economic characteristics, products and services. Sales of property and casualty insurance outside of the United States represented 5% of AFG’s revenues in 2017 and 4% of AFG’s revenues in 2016 and 2015. The following tables (in millions) show AFG’s assets, revenues and earnings before income taxes by segment and sub-segment.
| 2017 |  | 2016 |  | 2015
Assets |  |  |  |  |
Property and casualty insurance (a) | $ | 17,171 |  |  | $ | 15,574 |  |  | $ | 14,689 |
Annuity | 37,179 |  |  | 33,409 |  |  | 29,865 |
Run-off long-term care and life | 730 |  |  | 752 |  |  | 772 |
Other | 5,578 |  |  | 5,337 |  |  | 4,511 |
Total assets | $ | 60,658 |  |  | $ | 55,072 |  |  | $ | 49,837 |
Revenues |  |  |  |  |
Property and casualty insurance: |  |  |  |  |
Premiums earned: |  |  |  |  |
Specialty |  |  |  |  |
Property and transportation | $ | 1,711 |  |  | $ | 1,662 |  |  | $ | 1,599 |
Specialty casualty | 2,186 |  |  | 2,006 |  |  | 2,011 |
Specialty financial | 576 |  |  | 557 |  |  | 517 |
Other specialty | 106 |  |  | 103 |  |  | 97 |
Total premiums earned | 4,579 |  |  | 4,328 |  |  | 4,224 |
Net investment income | 362 |  |  | 350 |  |  | 319 |
Other income (b) | 28 |  |  | 51 |  |  | 78 |
Total property and casualty insurance | 4,969 |  |  | 4,729 |  |  | 4,621 |
Annuity: |  |  |  |  |
Net investment income | 1,458 |  |  | 1,356 |  |  | 1,224 |
Other income | 103 |  |  | 103 |  |  | 98 |
Total annuity | 1,561 |  |  | 1,459 |  |  | 1,322 |
Run-off long-term care and life (c) | 47 |  |  | 49 |  |  | 188 |
Other | 283 |  |  | 240 |  |  | 194 |
Total revenues before realized gains (losses) | 6,860 |  |  | 6,477 |  |  | 6,325 |
Realized gains (losses) on securities | 5 |  |  | 19 |  |  | (19 | )
Realized gains (losses) on subsidiaries | — |  |  | 2 |  |  | (161 | )
Total revenues | $ | 6,865 |  |  | $ | 6,498 |  |  | $ | 6,145 |
(a) | Not allocable to sub-segments.
(b) | Includes income of $32 million (before noncontrolling interest) from the sale of an apartment property in 2016 and $66 million (before noncontrolling interest) from the sales of a hotel and an apartment property in 2015.
(c) | AFG sold substantially all of its run-off long-term care insurance business in December 2015.
| 2017 |  | 2016 |  | 2015
Earnings Before Income Taxes |  |  |  |  |
Property and casualty insurance: |  |  |  |  |
Underwriting: |  |  |  |  |
Specialty |  |  |  |  |
Property and transportation | $ | 154 |  |  | $ | 166 |  |  | $ | 48 |
Specialty casualty | 104 |  |  | 78 |  |  | 146 |
Specialty financial | 61 |  |  | 84 |  |  | 87 |
Other specialty | (2 | ) |  | 9 |  |  | 14 |
Other lines (a) | (75 | ) |  | (101 | ) |  | (70 | )
Total underwriting | 242 |  |  | 236 |  |  | 225 |
Investment and other income, net (b) | 349 |  |  | 341 |  |  | 351 |
Total property and casualty insurance | 591 |  |  | 577 |  |  | 576 |
Annuity | 380 |  |  | 368 |  |  | 331 |
Run-off long-term care and life (c) | 6 |  |  | 2 |  |  | 14 |
Other (d) | (258 | ) |  | (181 | ) |  | (176 | )
Total earnings before realized gains (losses) and income taxes | 719 |  |  | 766 |  |  | 745 |
Realized gains (losses) on securities | 5 |  |  | 19 |  |  | (19 | )
Realized gains (losses) on subsidiaries | — |  |  | 2 |  |  | (161 | )
Total earnings before income taxes | $ | 724 |  |  | $ | 787 |  |  | $ | 565 |
(a) | Includes special charges to increase asbestos and environmental (“A&E”) reserves of $89 million, $36 million and $67 million in 2017, 2016 and 2015, respectively. Also includes $18 million in favorable development related to the Neon exited lines recorded in connection with a reinsurance to close transaction in 2017 and a charge of $65 million related to Neon exited lines in 2016.
(b) | Includes income of $32 million (before noncontrolling interest) from the sale of an apartment property in 2016 and $66 million (before noncontrolling interest) from the sales of a hotel and an apartment property in 2015.
(c) | AFG sold substantially all of its run-off long-term care insurance business in December 2015.
(d) | Primarily holding company interest and expenses, including losses on retirement of debt of $51 million in 2017 and $4 million in 2015, and special charges to increase A&E reserves related to AFG’s former railroad and manufacturing operations ($24 million in 2017, $5 million in 2016 and $12 million in 2015).

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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