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Segments of Operations - Earnings before income taxes by segment and sub-segment (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Segment Reporting Information [Line Items]

Earnings before realized gains (losses) and income taxes

$ 719

$ 766

$ 745

Realized gains (losses) on securities

5

19

(19)

Realized gains (losses) on subsidiaries

0

2

(161)

Earnings before income taxes

724

787

565

Property and casualty insurance

Segment Reporting Information [Line Items]

Property and casualty insurance underwriting

242

236

225

Investment and other income, net

^[1]

349

341

351

Earnings before realized gains (losses) and income taxes

591

577

576

Annuity

Segment Reporting Information [Line Items]

Earnings before realized gains (losses) and income taxes

380

368

331

Run-off long-term care and life

Segment Reporting Information [Line Items]

Earnings before realized gains (losses) and income taxes

^[2]

6

2

14

Other

Segment Reporting Information [Line Items]

Earnings before realized gains (losses) and income taxes

^[3]

(258)

(181)

(176)

Property and transportation | Property and casualty insurance

Segment Reporting Information [Line Items]

Property and casualty insurance underwriting

154

166

48

Specialty casualty | Property and casualty insurance

Segment Reporting Information [Line Items]

Property and casualty insurance underwriting

104

78

146

Specialty financial | Property and casualty insurance

Segment Reporting Information [Line Items]

Property and casualty insurance underwriting

61

84

87

Other specialty | Property and casualty insurance

Segment Reporting Information [Line Items]

Property and casualty insurance underwriting

(2)

9

14

Other lines | Property and casualty insurance

Segment Reporting Information [Line Items]

Property and casualty insurance underwriting

^[4]

$ (75)

$ (101)

$ (70)

[1]	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.
[2]	AFG sold substantially all of its run-off long-term care insurance business in December 2015.
[3]	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).
[4]	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.

X

- Definition

Net investment income plus other income less other expenses.

+ References

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- Definition

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+ References

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- Definition

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563

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