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Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Gains (losses) on change in fair value of assets/liabilities:

Assets

^[1]

$ (8)

$ 131

$ (116)

Liabilities

^[1]

20

(116)

82

Management fees paid to AFG

18

17

15

CLO earnings (losses) attributable to AFG Shareholders

^[2]

23

37

(6)

Variable interest entity, primary beneficiary

Variable Interest Entity [Line Items]

Investment in CLO tranches

$ 215

$ 216

$ 266

[1]	Included in revenues in AFG’s Statement of Earnings.
[2]	Included in earnings before income taxes in AFG’s Statement of Earnings.

X

- Definition

Earnings (losses) of variable interest entities attributable to AFG shareholders.

+ References

No definition available.

+ Details

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Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Gain (loss) on change in fair value of assets of variable interest entities.

+ References

No definition available.

+ Details

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Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Gain (loss) on change in fair value of liabilities of variable interest entities.

+ References

No definition available.

+ Details

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Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Gains losses on change in fair value of assets liabilities collateralized loan obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	afg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Management fees paid by variable interest entities.

+ References

No definition available.

+ Details

Name:	afg_ManagementFeesPaidByVariableInterestEntities
Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Data Type:	na
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Period Type: