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Acquisitions and Sale of Businesses - Revenues, costs and expenses, and earnings before income taxes for the subsidiaries sold (Details) - Run-off long-term care insurance business $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Life, accident and health net earned premiums:
Long-term care	$ 73
Life operations	11
Net investment income	73
Realized gains (losses) on securities and other income	(11)
Total revenues	146
Annuity benefits	8
Life, accident and health benefits:
Long-term care	91
Life operations	11
Annuity and supplemental insurance acquisition expenses	12
Other expenses	16
Total costs and expenses	138
Earnings before income taxes	$ 8

X

- Definition

Annuity benefits of the disposal group includes 1) interest credited to policyholders accounts, which provides a guaranteed yield, 2) expenses related to excess benefits expected to be paid on future deaths and annuitizations and 3) net expenses related to changes in embedded derivatives on equity indexed annuities offset by equity index call options.

+ References

No definition available.

+ Details

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

X

- Definition

Annuity and supplemental insurance acquisition expenses of the disposal group.

+ References

No definition available.

+ Details

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Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The Life operations portion of life, accident and health benefits of the disposal group.

+ References

No definition available.

+ Details

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Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The Long-term care portion of life, accident and health benefits of the disposal group.

+ References

No definition available.

+ Details

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Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The Life operations portion of life, accident and health premiums of the disposal group.

+ References

No definition available.

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X

- Definition

The Long-term care portion of life, accident and health premiums of the disposal group.

+ References

No definition available.

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Namespace Prefix:	afg_
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X

- Definition

This item represents amount of other income attributable to the disposal group and the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity of the disposal group. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities of the disposal group.

+ References

No definition available.

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X

- Definition

Amount, after investment expense, of income earned from investments in securities and real estate of the disposal group. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

No definition available.

+ Details

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X

- Definition

Life, accident and health benefits.

+ References

No definition available.

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- Definition

Life, accident and health net earned premiums.

+ References

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- Definition

Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

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X

- Definition

Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

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- Definition

Amount of other expense attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

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- Definition

Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

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